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Are you making an idiot out of yourself on purpose? Have you read my very first message in this thread? Do you understand that 3D and 3D game are different terms? While 3D can mean anything, a 3D game has one specific meaning that is clear to everyone. Everyone except you, apparently.

A three-dimensional computer game (3D, English three-dimensional) is a game, a visual space that is entirely built from three-dimensional objects. The character is in three-dimensional space and in some games has complete freedom of movement. The first 3D game was Maze War (1973).
Three-dimensional games are fundamentally different from two-dimensional (2D) games, in which the game space consists of ready-made flat images - either hand-drawn or created by an artist in a three-dimensional modeling environment and then saved as ordinary images. The computer's task here is reduced only to combining these images in accordance with the game algorithms, which explains the low requirements of two-dimensional games for computer power. The freedom of movement of a character in two-dimensional games is limited: he can only move along the route provided by the developers.
Intermediate options between 2D and 3D are possible. Sometimes the term 2.5D is used for them.
  • The game space is three-dimensional, but the models of game objects - buildings, plants, characters - are flat pictures, sprites. An example is early 3D games such as Wolfenstein 3D and Doom. In modern 3D games, sprites are used only to display objects that are present in very large quantities (for example, grass and trees), as well as objects that are located at a great distance from the character. This is done to save computer computing resources: for example, modeling a completely three-dimensional tree with thousands of leaves is a very difficult task for a computer, and modeling an entire forest is an impossible task, and it is impossible to do without sprites.
  • The game space is two-dimensional, but the character models are three-dimensional. This technology is used in many quests. It allows you to combine high-quality two-dimensional hand-drawn backgrounds (usually partially animated) with “live” freely moving characters and at the same time does not require computer power. A striking example of such a game is Syberia.

You still do not get it, do you?

Tags. Are. Chosen. By. The. Publisher.

Maybe ponder a bit, what consequences this has. And that there are only 10 tags you can have. And that the devs not only chose the tags but create them. They are not from a fixed pool. You can use any tag. Even the ones you suggested. There are even people tagging "game". Or "indie". Even "3d game" is used as a tag.

With this knowlege you can answer all your questions yourself. Also the question, why it is not done what you propose. And not doable.

Also, if you quote external, please put a link. That read like stuff that people would copy onto wikipedia. And that is not always correct. But most importantly, it is not context appropriate. We are talking about tags on an indie gameing site. Not about technical terms or marketing buzz words. What good does it do, if you use technical correct terms, but no one using the site would search for them?

Should you still wonder how to find the games you want, maybe try actually searching for them. You will find out, how to find them. Browsing for a specific tag goes only so far. Use alternative tags that mean the same. Click on related games of games you like. Look at your recommendations. Look at the collections listed when browsing, someone might have made a 3d games collection. Or use the 3d tag and scroll past the vn. You can even browse for 3d and add the exclusion for visual novels. How to do that, look in other threads about tags. You will find it.

(1 edit)
And that there are only 10 tags you can have

Well, let's count together

  1. Singleplayer
  2. 2D
  3. Horror
  4. Adult
  5. Pixel Art
  6. Erotic
  7. Adventure
  8. 3D
  9. Short
  10. Atmospheric
  11. Visual Novel
  12. Retro
  13. Role Playing
  14. Action
  15. Fantasy
  16. First-Person
  17. Platformer
  18. Cute
  19. Puzzle
  20. Simulation
  21. Creepy
  22. Unity
  23. Romance
  24. Interactive Fiction
  25. Survival
  26. Story Rich
  27. Top-Down
  28. Tabletop role-playing game
  29. Shooter
  30. Psychological Horror
  31. Indie
  32. Dark
  33. LGBT
  34. Eroge
  35. Sci-fi
  36. Arcade
  37. Sprites
  38. Casual
  39. Anime
  40. RPG Maker
Page 1 of 14

Already on the first page I see more than ten tags. And there are many pages with tags on the site. Where did you get the number 10 from?

There are even people tagging "game". Or "indie". Even "3d game" is used as a tag.

I found the indie tag in the list of tags. The rest are not there.

With this knowlege you can answer all your questions yourself. Also the question, why it is not done what you propose. And not doable.

I never received answers to my questions. Why is the 3D tag added to games that do not correspond to the description of this tag on the site and no one does anything about it? Why can't you remove this tag and add two others as I suggested?

What good does it do, if you use technical correct terms, but no one using the site would search for them?

There will be no benefit until these correct tags are fixed on the site. Let's say I'm a game developer, I add my game but I don't find a suitable tag in the list of site tags. What to do? Can I make my own? You are trying to convince me that I can. Fine. What's the point of this? The site does not offer this tag. There is only one game marked with this tag. Naturally he will not be successful.

But we need to officially add the 3D game and 3DCG tags so that they are displayed on the site, then they will be used and it will make sense. The current 3D tag can be changed to 3DCG, this will be more correct, and the 3D game tag can be added separately. If the tag is officially accepted, it will begin to be used

Should you still wonder how to find the games you want, maybe try actually searching for them.

How? You still haven't answered how I can search for 3D games? How to do it? There is no suitable tag on the site

Use alternative tags that mean the same.

There are no such tags on the site. There are only those that narrow the search and display even fewer games than needed

You can even browse for 3d and add the exclusion for visual novels.

Do you see a minus symbol somewhere here? I only see "plus". I see how to add another tag to the search. But there is no button to exclude their search tag

Is this a translation issue? Do you not understand what is written here?

"10 tags you can have" is not the same as "10 tags to chose from". You (as a publisher) can only select 10 tags for a project.

(1) I never received answers to my questions. (2) Why is the 3D tag added to games  (3) that do not correspond to the (4) description of this tag on the site and (5) no one does anything about it? (6) Why can't you remove this tag and add two others as I suggested?

(1) You did. Just read them again.

(2) Wrong assumption. It is the devs that do it. Talking in passive form implies that itch or some automatic does it.

(3) That is a matter of opinion in most cases, including "3d".

(4) Feel free to click the link below the tag description that reads "Suggest updated description".

(5) About what? People having different opinions than you about what constitutes correct usage of tag 3d?

(6) Who is you? You are not talking to itch representatives here. Your are arguing in a community thread. Itch can't remove a tag in a system, where tags are created by users of the site. They might block an offensive tag, but otherwise, what tags are used and who uses it for what, is completely user driven.

Oh, and this is used by a few games https://itch.io/games/tag-3d-game This is not https://itch.io/games/tag-3dcg

Both the tags you propose exist already. But no one uses the second one.

There will be no benefit until these correct tags are fixed on the site. Let's say I'm a game developer, I add my game but I don't find a suitable tag in the list of site tags. What to do? Can I make my own? You are trying to convince me that I can. Fine. What's the point of this? The site does not offer this tag. There is only one game marked with this tag. Naturally he will not be successful.

 I do not need to convince you. See and believe! The point is, that itch offers general purpose tagging, as you would see on a photo album site.

Oh, and according to your logic, all the 170 games in that list would be unsuccessfull because of their usage of that tag.

https://itch.io/games/tag-banana

You still haven't answered how I can search for 3D games?

And this from someone accusing me of making an idiot of myself on purpose. I already gave my advice. You do not need to take it, but stop acting like it was not given.

Do you see a minus symbol somewhere here? 

How to do that, look in other threads about tags. You will find it.

You need to actually read the answers. The method to do tag exclusion, is talked about in several threads. For someone nitpicking on a technical definition you sure act like a tech illiterate.

You (as a publisher) can only select 10 tags for a project.

Did I write somewhere that I am a publisher? I am a user who is not satisfied with the current tagging system.

Okay, let's say I was a publisher. And what does this change? Do you want to say that if instead of the “3D” tag, there are two tags “3D game” and “3DCG”, will this somehow negatively affect publishers? Nothing like this. Now, regardless of the description of the 3D tag, publishers add it to themselves to attract attention. If instead of one tag there are two, publishers will set themselves one of the tags, the one that suits them best.

(3) That is a matter of opinion in most cases, including "3d".

What opinion are you talking about? On the website, the 3D tag has a specific description, which narrows all variations of this term to a more specific one. If the site didn’t have a description of the tags, it wouldn’t matter. But there is a description

(4) Feel free to click the link below the tag description that reads "Suggest updated description".

And what will this change? If I offer my description, will all game developers listen to the change and correct their tags? I doubt

(5) About what? People having different opinions than you about what constitutes correct usage of tag 3d?

Then answer a simple question. Why was the language invented? Speech. Words. Why is all this necessary if people are not able to understand each other because no one uses dictionaries and the same word has a different meaning for each person? Why do we use words at all if we cannot understand their meaning? Replace tags with pictures and nothing will change. Let's communicate like primitive people with cave paintings.

That’s why words are needed to exchange specific meanings. if I say "sea". So I mean the sea. A sea is a large body of salty water. There is a word and there is a specific meaning of this word. The same goes for tags. What does the "first person" tag mean? Does this tag have multiple different meanings? Does everyone understand it differently? Or does the tag have one meaning in the context of games? Likewise, the 3D tag should have one meaning so as not to confuse people, otherwise the tag is useless. We use tags to narrow down the search and not to confuse it.

But no one uses the second one.

Nobody uses it? And what's that? Enough mentions

Oh, and according to your logic, all the 170 games in that list would be unsuccessfull because of their usage of that tag.

What does this have to do with the “unsuccessfull” game and the use of one unsuccessful tag in it? If the game only had these unpopular tags and an unattractive name, then obviously the game itself would be unpopular. But these games also have other, more popular tags, tagged 16-bit (6,145 results), Platformer (128,458 results)

You need to actually read the answers. The method to do tag exclusion, is talked about in several threads.

Do you know what it's called on the Internet? This is called "sending in rough form". Instead of answering how to do something, you send me to look for how to do it. Why did you even come to this topic then? This is a universal answer to any question. A person comes to the forum, asks for something, and they answer him - go and look for it yourself. GREAT! This is the most useless and, moreover, offensive message. Or maybe the tag exclusion method is so complex that you don't understand it yourself? Then everything is clear. If you yourself are technically illiterate, then don’t try to teach others.

Learn English, or use a better translator, and most importantly learn how to extract meaning from words. You were given answers, but you refuse to understand them. Or you are unable to.

Did I write somewhere that I am a publisher?

This question demonstrates your lack of language comprehension.

Read this:   https://en.wikipedia.org/wiki/You#Third_person_usage

publishers add it to themselves to attract attention. If instead of one tag there are two, publishers will set themselves one of the tags, the one that suits them best

You might hope to attract attention. But you tag what you deem fit for your project. You can even invent tags. Never saw an open tagging system? It is as open as hashtags are on social media. So go to X and complain that people invent tags all day, instead of using predefined ones.

 If the site didn’t have a description of the tags, it wouldn’t matter. But there is a description

There is two problems here. First, those descriptions are "descriptions" and not "definitions". Look up the words, if you have trouble with the meaning of those words. Second, the description of the 3d tag is as non commiting as it can be. It merely says, it is 3d games. Which does not give you any new information. You alread are browsing for games and you already have selected 3d.

With an open tagging system, you do not consult any descriptions. You just write in the tags you think would describe your game or should be associated with the game. It is tagging, not selecting categories like game or not game.

Will it be easier for you to understand if you think about it as a tweet with hashtags? Here look at my new game #indie #3d #visualnovel.

And what will this change? If I offer my description, will all game developers listen to the change and correct their tags? I doubt

Read your reply again. You are beginning to understand why it is not doable, what you propose ;-)

And as said many times here: tags are chosen by the devs. This has consequences. Including that you cannot retroactivly change what tags mean or force devs to select certain tags.

Please do not reply with yet another demonstration of you not understanding the different uses of "you".

Why is all this necessary if people are not able to understand each other

I fear the irony of this is lost on you.

Nobody uses it? And what's that? Enough mentions

Those are all adult games. Set your settings to ( ) Show content marked as adult in search & browse and try again. Also, this is open community, please do not post screenshots of adult games or their thumbnails here.

It seems the tags you are looking for are only (!) used in adult games. No non-adult game uses this tag here on itch.

But nevertheless, you proven to yourself, that the tags you propose already exist.

If the game only had these unpopular tags and an unattractive name, then obviously the game itself would be unpopular

This is not what you claimed. You are using a strawman argument fallacy. You did not write, that a game needed to select only non-used tags to be unpopular. You only talked about a single tag and made no mention about the other 9 tags. Also, what you conclude does not follow from the premise. There are games here that are popular yet do not have any tags at all! You can release a game here and not even be on the index, and have success. Did it not occur to you, that games are marketed outside of itch? Itch staff specifically recommends to not rely on internal marketing from existing on the index.

 go and look for it yourself.

I told you the terms to look for.

https://itch.io/community/search?category_id=0&query=tag+exclusion

Did you even try to look? There even is a sticky thread about it. It is at the very top of the list in ideas and feedback subforum.

So go to X and complain that people invent tags all day, instead of using predefined ones.

What is X and why should I complain about this site there?

Just because anyone can create their own tag does not mean that anyone will use them. These tags are not in the list of tags, they do not have descriptions, and therefore they will not be used by ordinary site users. They just don't know that such tags exist.

Regarding the language. The site has been translated into my language. Maybe you should learn my language?

It merely says, it is 3d games. Which does not give you any new information. You alread are browsing for games and you already have selected 3d.

And you still teach me the language? What is 3D anyway? Literally three dimensions. Is there a third dimension in flat visual novels? Did you study geometry at school?

With an open tagging system, you do not consult any descriptions.

So words are not important? I can attach any tags to my game, the most popular tags, to attract attention, and no one really cares if I blatantly lie? Great "open" tagging system. Why then do we need tags at all if when I search for something specific I don’t get it? If I choose “first-person”, then there may well be “second-person” and “third-person” games, and do you think this is completely normal?

And as said many times here: tags are chosen by the devs.

Are you saying that tags are added by developers? You are blatantly lying! If this is the case, then why are these tags not in the tag list? I checked all the pages!

https://itch.io/tags https://itch.io/tags?page=8
https://itch.io/tags?page=2https://itch.io/tags?page=9
https://itch.io/tags?page=3https://itch.io/tags?page=10
https://itch.io/tags?page=4https://itch.io/tags?page=11
https://itch.io/tags?page=5https://itch.io/tags?page=12
https://itch.io/tags?page=6https://itch.io/tags?page=13
https://itch.io/tags?page=7https://itch.io/tags?page=14

Нет тегов 3DCG или 3D-игр. Их нет ни на одной странице. А раз их не существует, значит, ими мало кто будет пользоваться. И пользователи, и разработчики. Пока тег не будет официально присвоен, он будет менее популярен.

What is X and why should I complain about this site there?

That you need to use a better translator was not an insult. I am serious. Also, how can you be on the internet and not notice that Twitter changed its name to X?

therefore they will not be used by ordinary site users. 

You already proved yourself incorrect by browsing the 3dcg tag. All those games have a tag that is not in the suggested list and that has no description.

Maybe you should learn my language?

This is an US based site. Parts of it are available localized, but there is no system of localizing game pages and community is still in English. You asked on English speaking community forum in English. And in English you got answers. Also English is not my native language either.

And you still teach me the language? What is 3D anyway? Literally three dimensions. Is there a third dimension in flat visual novels?

You seem to have a need for it. 3D is short for three dimensions. So far so correct. But the tag 3D is not the same as the abreviation 3D. It is whatever people use it for. Cinemas use the same abreviation for stereoscopic movies. Are the 3d games you are looking for in stereoscopic vision? Context is important. Context here is a tag and its usage. And there is a difference if you use classic "drawn" characters or 3d rendered images, even if the game is "flat".

You can suggest a different usage, but as you yourself already noticed, it is impossible to convince all the developers to change their opinion about the meaning and usage of the tag 3d, so they would migrate to use 3dcg for flat images.

It all boils down to the statement several people told you: devs chose the tags. It is all there is to it. You can complain and be annoyed by it. But neither you nor itch can change this. Oh, sure, in a trivial sense, itch could overhaul the tagging system and radically change it, but this is not gonna happen anytime soon. They might switch to a predefined set one day, who knows. But I doubt it. There are even tags for som jam participiants.

So words are not important? I can attach any tags to my game, the most popular tags, to attract attention, and no one really cares if I blatantly lie?

Tags are not words, they are tags. And delibaretly spamming tags is discouraged.

https://itch.io/docs/creators/quality-guidelines#do-not-use-unrelated-tags-or-cl...

Adding tags, tools, engines, and classifications that are unrelated to your project in an attempt to increase its visibility is against our rules. 

The important word here is "unrelated". 3d is related to visual novels using 3d rendered images. 

Are you saying that tags are added by developers (1)? You are blatantly lying (2)! If this is the case, then why are these tags not in the tag list (3)? I checked all the pages!

(1). They are selected by the devs and any tag can be selected, even one that is not in the list or does not exist yet. Yes. This is so. You can browse ANY tag and will not get a 404 error message. This is an open tagging system. It has advantages, it has disadvantages. You can think about this whatever you like, but this is how it works on itch.

https://itch.io/games/tag-thistagdoesnotexist

(2). Quit your insults. I am not at fault for you not understanding or believing what was told to you.

(3). I do not know and I do not care. But it does not look like an automated list. Probably a site admin curates the list from time to time. The tags on that list are sometimes called suggested tags.

I suggest you use the feedback button on the left side of your profile. If you do not see it, change the zoom level of your web browser. Tell itch to change the see all tags button, because it is misleading. It should read, see suggested tags or something like that. It made you think that "all tags" means that it will show exhaustivly all tags. It does not. It only shows this list of whatever they call it internally. Maybe suggested tags.

There are serious problems and pitfalls with the tagging system here. But you can find interesting games, if you see an interesting tag on a game you already found. The game info box will have links to those tags. That is how I found out, that the list is incomplete and you can write and guess any tag. Like the banana tag.

But I do not consider the usage of some popular tags like 3d to be an issue. If we start to open this can of worms, you can complain about half of the horror games here. The horror tag description is wrong to begin with. But, well, horror here is used for some jump scares. Meh. Whatever.

Oh, and not even with a closed tagging system as on Steam you will get all "3d" games according to your defintion with a catch-it-all tag. So just use the common tags used usually for this type of games. There is no single tag that will be used for all of them.

That stuff is really hard to translate. Try using the output of the translator as input and do it again to see how funny some things read after translation. I know what you meant, but the translated stuff was just garbage.

It is an advantage to have a few tags that are seldom used. Like 200 games. You are linked by the other 199 games via the game info box. And competition against 200 games is different than against 5000. I found many games this way. Just look at 3dcg as an example.

Also, how can you be on the internet and not notice that Twitter changed its name to X?

Or maybe you shouldn’t think that the whole world revolves around you and your social networks? First of all, your Twitter is not popular in all countries. Secondly, in some it is even prohibited. Who would use a garbage dump in which even personal messages are paid?

All those games have a tag that is not in the suggested list and that has no description.

Now answer a simple question. How would I have known about the existence of this tag if you had not told me about it? It's not in the list of tags.

Context is important.

That's right, context is important. How can games be classified? According to the genre, but 2D is not a genre. Based on the location of the camera, this is also not suitable. Technologies of graphic image. This is what you need.

Classification according to graphic image technology:

  • Lack of graphics (text games, pseudo-graphics)
  • 2D graphics (vector, raster)
  • 3D graphics
  • 3D image (stereo glasses)
  • Augmented reality (mobile devices with a video camera)
  • Virtual reality (virtual reality helmet)

As you can see, everything falls into place here. When it comes to 3D, in the context of games. The first suitable definition is 3D games. Game with 3D graphics. Stereoscopic games came later and are less common.

So you're screwed again.

But neither you nor itch can change this.

And again a lie. itch can change everything. How? It is enough to remove the 3D tag from the list of tags and clear its description. On the contrary, add the tags “3D game” and “3DCG” to the list of tags and write a description for them. Then everything will fall into place. The 3D tag is ambiguous, and therefore it should not be supported. The tags “3D game” and “3DCG”, on the contrary, are very clear. This, of course, will not eliminate false tagging, but it will definitely benefit the site and users.

Tags are not words

What class are you in? Have you even finished school? Can you write me a definition of what a “word” is?

3d is related to visual novels using 3d rendered images. 

3d means three dimensions. Most visual novels don't have three dimensions. Flat sprites on flat backgrounds. If a character in a visual novel were a 3D model, or the character's background was 3D, then the 3D tag would be appropriate.

Q You're talking about a 3D style of images that still remain flat. With the development of various games with a built-in visual studio, there are too many “3D” crafts on renpai. People simply take screenshots in the studio of some game, insert these screenshots into their game and post them on the Internet as a “3D game”. Previously, this kind of crap didn’t exist, but now self-respecting sites have started tagging such games with the 3DCG tag so that beautiful screenshots wouldn’t mislead people

(1). They are selected by the devs and any tag can be selected, even one that is not in the list or does not exist yet. Yes. This is so. You can browse ANY tag and will not get a 404 error message.

With every message you seem dumber and dumber to me. How will the user understand that there is a tag on the site that is not in the list of site tags? HOW WILL HE KNOW? Don't you see the problem here? I see. If the tag is hidden, then what difference does it make whether it is there or not?

This is my first time visiting the site. And I want to find interesting games based on tags. What tags will I use? That's right, those tags that I see in the site interface. I repeat the question once again. How do I know that the site has tags if they are not in the list?

(3). I do not know and I do not care. But it does not look like an automated list. Probably a site admin curates the list from time to time. The tags on that list are sometimes called suggested tags.

THIS CAN'T BE HAPPEN (sarcasm). You said that itch cannot influence anything and everything is decided by game developers. And now it turns out that itch does decide something? So maybe my proposal to add tags to this list still makes some sense?

Tell itch to change the see all tags button, because it is misleading. It should read, see suggested tags or something like that. It made you think that "all tags" means that it will show exhaustivly all tags.

THIS CAN'T BE HAPPEN (sarcasm). It looks like I “heard” the first reasonable thought from you during our communication

That is how I found out, that the list is incomplete and you can write and guess any tag.

Well, I never looked at the description under the spoiler. What useful information is there? Game platform? I select it during the search, and I know for sure that I will only find PC games. Tags? I only look at them while searching. If I went to the game’s page, it means I’m already interested in it and the rest doesn’t matter.

But what I used was the “Similar Games” button. The site searches for games with similar tags, but only uses official tags. This is easy to check. Take the link - https://itch.io/games/tag-3dcg

This is a list of games that are EXACTLY tagged with the 3dcg tag. We open each game and look at similar games.

  1. Related tags: Visual Novel Adult Erotic Ren'Py Romance
  2. Related tags: Visual Novel Adult Erotic
  3. Related tags: Visual Novel Adult Anime Male protagonist Parody Romance Visual Novel
  4. Related tags: Visual Novel Adult Dating Sim Erotic Management Simulation Story Rich
  5. Related tags: Adventure Adult Parody
  6. Related tags: Role Playing Adult Erotic Fantasy Gay Monsters Point & Click Role Playing Sandbox Singleplayer
  7. Related tags: Visual Novel Adult Adventure Furry Sandbox Unity
  8. Related tags: Visual Novel Anime Cute Fantasy Parody Ren'Py Visual Novel
  9. Related tags: Visual Novel Adult Male protagonist Multiple Endings Visual Novel
  10. Related tags: Visual Novel Adult Erotic Male protagonist Ren'Py Story Rich
  11. Related tags: Visual Novel Adult Erotic Female Protagonist Male protagonist Ren'Py Visual Novel
  12. Related tags: Visual Novel Adult
  13. Related tags: Visual Novel Adult Adventure Unity
  14. Related tags: Visual Novel 3D Adult Erotic Fantasy Visual Novel
  15. Related tags: Puzzle Erotic Lesbian Puzzle
  16. Related tags: Visual Novel Adult Male protagonist
  17. Related tags: Visual Novel Adventure Fantasy Male protagonist Visual Novel
  18. Related tags: Visual Novel Adult Male protagonist Ren'Py Romance Story Rich

I looked at 18 games, and none of them offered me games with the 3DCG tag. If this tag is added officially, the situation will change

***

And I didn’t understand what you wrote next.

I bought myself a video card. Not very powerful, but before I didn’t have a video card at all (Ryzen with integrated graphics). And now I can play more demanding and non-optimized games. Large AAA 3D games are usually more optimized than Unity games. And now, having a normal video card, I want to play 3D games. But before that I need to find them, but I can’t. Due to the fact that under the 3D tag, everything is mixed up. If I use any other tag, I couldn't find what I need. I need a 3D tag or a 3D game tag

How would I have known about the existence of this tag if you had not told me about it? It's not in the list of tags.

You click the little info box on a game page and there you click on a tag. Or you guess common words that might be used.

There will always be people disagreeing with the choice of tags or even the meaning of tags. Or their relevance. You disagree with both, ok. Moving on.

And again a lie

Quote the whole thing. And not a part of it, that you can construe to your childish accusation of lying.

It is enough to remove the 3D tag from the list of tags and clear its description.

This is naive. The tags you suggest already exist, and almost no one bothers to use them or write a description for them. Did you write a description for them? If enough people do this, those tags might get a description. 

I think this is the core of the misunderstanding here: you expect tags to be used by a set of rules and strict definitions of tags. But that is not what tags are. They are an association with a concept. Not a pledge to adhere to a definition. The use of the term "description" and the fact that users can suggest new description for a tag should make this clear.

Tags do not follow any such ruleset. You did notice that devs are not required to fill up all their 10 tags? And more important there is no rules in which order the tags have to be chosen. Imagine this game:

It is "3d", uses "3dcg" as rewards, is a "3d game", is made in "Unity", "single-player", has "puzzle"s, was participant in "Ludum Dare" game jam, is "educational", has some "sports", the game is also scary as it is a "horror" game, it is playable "casual" and is of course "indie", the style is "Anime", the game is "funny" and has "multiple endings", it features "zombies" and "robots",  it can be played with a "controller" and features a "story rich" background of  "time travel", because, why not.

I count about 20 things I would like to tag. But which should I chose? And how do I judge the relevance of each tags? I might even chose to not select any of the 3d tags. There is no requirement to tag the dimensions of the game graphics. Now that would be a suggestion, to have a separate quality that devs could select. There is the input type in the game info box. You can put mouse, keyboard, controller and such in there. What you seek is an output type. 

Can you write me a definition of what a “word” is?

Your insulting is getting boring. 

But here you go. It depends on the context what you mean with "word". But they key attribute of words, is, that they are the building blocks of sentences and speech.

Tags are labels, qualities, attributes, whatever you might want to call them. They are even words according to the naive definition of, a word is a thing I can say.

To put it differently: tags are made out of words, but are not used as words. It is the words that are used as tags. And they can have different meaning in their usage as tags. Different from any definition in a dictionary or their technical meaning.

but now self-respecting sites have started tagging such games with the 3DCG tag

3dcg stems from games that used cg as a (short) term for the rare ingame graphic, that was static computer generated (images). Typically the reward pic. You might have noticed a certain common attribute all the games here on itch that used that tag do have.

Also, if you check google trends, you will find, that the term 3dcg has the same search frequency, as it had 5 years before. This is not a new term, nor is it used the way you think it is used. It also has not the meaning of screenshots. It just means computer generated. 

You might find a nieche site  that does have central "tagging" according to their own rules and put those screenshot games into 3dcg category. It is not wrong, but misleading. Other nieche sites will show you high quality short movies and pictures made in advanced raytracing apps not unlike the ones that produce cinema animation movies for the same "tag". Actually, you probably are used to one of those sites and think all sites are like this.

But what I used was the “Similar Games” button. The site searches for games with similar tags, but only uses official tags.

It says related. That is not quite the same as similar, but I do not know what the intention is. I would expect a selection of games according to the motto of: if you like this game, you might also like those games.

If it is merely a: look, those games have shared tags, what is the point? I can just click those tags in the game description. I can even combine the most important tags, that I liked the most. There is little of a button that does just this.

Also I tried a bit. Explain, why I can click related games on a game that only has one tag and will find lots of games, but none of those games share the single tag the game had. Or another situation, the games shown only share one or two of the tags.

This is speculation, but the tags it shows on related game, might just be the suggested tags and have little to do with the games shown. It takes about three months for the algorithm to analyze what games are related to each other. And itch will not tell how it works, because people will try to exploit this information. Also, they include random in ranking and in search results.

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But to end this. I believe I know exactly what you seek and why you do not find it. But I will not discuss specifics in open community.

The problem is, this is an indie platform. For indie games. This is amateur and hobby game developers without much budget, with the occasional small game studio. 3d is not cheap. It is more difficult to develop and it does not run on the potato level machines and mobile devices often used by users of the site. So using 3d will decrease the size of the audience, in addition to being hard to do.

What does this mean for your little search predicament. It means that you search for games, that are rare here. Especially in the nieche you are browsing.

You will find some here

https://itch.io/games/made-with-3ds-max

And of course with the 3d tag. Or the other tags I mentioned that imply a 3d game environment, most common is third-person. But you will not get an exhaustive list of such games with any tags.

(+1)
With an open tagging system, you do not consult any descriptions. You just write in the tags you think would describe your game or should be associated with the game. It is tagging, not selecting categories like game or not game.

To elaborate.

The tagging comes first. Then comes the description what people use those tags for.

And that would also be the explanation why the 3d description is so vague. Or why you can propose a new description for a tag.