Klax

We have Klax games availables on Sega Genesis, NES

Tengen Puzzle Atari Gem Arcade

Klax is Atari's (under their Tengen label here) answer to Tetris. In particular it is what they produced when it was not clear if they would be able to legally release a Tetris cartridge again. Like most Tetris-style games, gameplay is somewhat addictive.