Hatris

Hatris (ハットリス, Hattorisu) is a 1990 puzzle video game developed by Alexey Pajitnov and Vladimir Pokhilko of ParaGraph for Bullet-Proof Software. An arcade version was manufactured by Video System. Hatris plays similarly to Pajitnov's previous Tetris, in that game objects falling from the top of the screen must be arranged in specific patterns to gain points and to keep the play area clear. In Hatris, hats of different styles fall from the top of the screen and accumulate at the bottom. To eliminate hats from the play area, five hats of identical style must be stacked. Different style hats stack differently. Hatris was originally developed with different ideas, such as using utensils and other kitchen objects before eventually settling on hats. Alexey Pajitnov decided the team settled on hats as it was the most fun of the objects. Hatris was showcased by Bullet-Proof Software at the Nintendo booth of the Consumer Electronics Show in 1990. An arcade version was developed by Video System.