Thank you! I did my best to try to explain how to get them here:
How to open endings 12, 14 and 17.
Ending 12) to get this ending you need to go to the cottage in your normal outfit. Then you need to win the trivia so you can search the apartment while Jan is passed out. Then go upstairs to get the key from the nightstand 2, then proceed to the basement. You can now open the cabinet in the basement with the key, do that. Then you need to look at the sketchbook. You need to say "you liked the art." After that look at the book on the table, then go back upstairs to wake up Jan. Kill him and have revenge.Ending 14) You can get the ending titled 14 from two places. So I’ll explain both but both endings have the same ending picture so going through one is enough.
First method: at the bar select the first drink, then accept hookup to proceed the story. Choose your nightclub outfit to get to the right route. decline blindfold, decline being tied up, accept when it’s not too tight to tie the hands, then try to escape. Choose the basement. Hide under the stairs.
second method: at the bar select the third drink, then accept hookup to proceed the story. Choose your nightclub outfit to get to the right route. do all the same here but this time choose the forest. Hide behind the tree.
Ending 17) to get this ending you need to also choose the same path as the ending 14, so to get to the cottage in the nightclub outfit. You need to choose the first drink and go hide in the closet and choose to “Be quiet and hold tightly from the doorhandle.”
Hope this helps. If you have more questions ask away!! :)