It's tetris! There's not much more to say lol.
- [left]/[right]: move left/right
- [up]/[down]: rotate counterclockwise/clockwise
- [jump]: move down faster
The game ends when the stack reaches the top or when the total number of effects reaches the entity limit (see text on the left)
If there is more than one player, a random player is chosen at the start of the match.