Hatris

Hatris (ハットリス) is a puzzle video game developed by Alexey Pajitnov and Vladimir Pokhilko of ParaGraph for Bullet-Proof Software. An arcade version was manufactured by Video System.

Gameplay
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.

Ports
Hatris was released in arcades, on the Nintendo Entertainment System, Game Boy and TurboGrafx-16, and on the NEC PC-9801 home computer. Additionally, two versions of the game exist on the Sharp Wizard, the first of which being released in December 1990, and the second being called Organizer Hatris and releasing in 1991.

Hatris DX, a mobile remake of the game, was released by Alti in 2004. Another mobile version of the game was released by G-Mode in 2006.

An unofficial port of Hatris exists on the Acorn Archimedes, being developed by Joeri De Winter and first releasing on 18 September 1997.

Reception
In Japan, Game Machine listed the arcade version of Hatris on their June 1, 1990 issue as being the eighteenth most-successful table arcade unit of the month.

Entertainment Weekly gave the Game Boy version of Hatris an A and wrote: "There is, after all, a cure for Tetris addiction. It’s Hatris, a habit that's even harder to kick."