It's an interesting game. Some of the interactions don't seem logical to me. Three blocks become one but four become 2. Why? I got to the lettered ones. I have no idea what is supposed to be done there. I think reskinning it to be more that just blocks would make an appealing game.
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The reason that 4 blocks become 2 blocks, is because 3 of the blocks become one, and leave the other block alone, leaving 2 blocks. Also, the “H”and the “V” blocks move in only a certain direction (H move horizontally, V move vertically). As for the the reskinning part of your post, that is just a matter of opinion. Thank you for the review, it is much appreciated!