Hatris is a Tetris-type game from Video Systems
In Hatris, hats of different styles fall from the top of the screen and accumulate at the bottom.
The game is played by making vertical stacks of hats. When a stack of five hats of the same
type and color is created, it disappears.
The challenge of the game is that different styles of hats will stack differently.
The game ends when one of your stacks of hats reaches the top of the Screen.