I'm making a clicker game where each upgrade is a very shrunken down version of an existing game. The last one I need is Tetris before the game is pretty much done. The “micro-game” should be the size of a small button with all the 24 different buttons before it cluttering up all remaining room. It should be a creative way to incorporate some aspect of Tetris into the clicker game while still making sense as part of a clicker game, so it needs to change a single variable and it shouldn't take you to a seperate game or something else seperate from the main game since it should be incorporated with the rest of the games which will keep running even if this upgrade is being used. It doesn't need to be something directly from the game, though, I just need some aspect of the game to be present. I could probably code whatever but I don't have any ideas on how to incorporate Tetris as an upgrade. Any ideas?