Commodore PET + Petris

Play Tetris on Commore PET machine!

In the vast and varied software library of Commodore home computers, puzzle games played an important role. While titles like Boulder Dash and Bombuzal gained fame, some lesser-known gems also carved out a space among enthusiasts. One such title is Petris, an unofficial Tetris-style puzzle game that found a home on Commodore systems like the Commodore 64.

Originally created in 1984 by Alexey Pajitnov in the Soviet Union, Tetris became a global sensation, appearing on systems from the Game Boy to IBM PCs. Its simple yet addictive mechanic of rotating falling blocks to complete lines captured millions of players worldwide. As Tetris spread, many clones and unofficial versions appeared across platforms, including Commodore computers.

Petris is one of several unofficial Tetris clones developed for Commodore 64 ja Commodore PET systems. The name “Petris” itself is believed to be a portmanteau of “PET” and “Tetris,” reflecting the game’s origins as a puzzle game programmed for the Commodore PET and later adapted to the C64.

Petris exemplifies how popular game concepts like Tetris were adapted and reimagined across platforms—even unofficially. On the Commodore 64 ja PET, Petris brought addictive puzzle gameplay to users through public domain programming and grassroots distribution. In the world of retro computing, Petris remains a simple yet charming reminder of the ingenuity of early home computing communities.