Not to be confused with Hatris.

Hatetris is a fan game based on Tetris, created by Sam Hughes, that can be found online. It always drops the worst piece for the player at that moment (by evaluating their current stack) and makes them play it (no Hold piece or piece previews) which makes life very difficult. However, there is no gravity, giving the player infinite time to place each piece down in the playfield. The world record is 31 lines cleared.