Zapactris

When Tetris first appeared, the VIC-20 was already commercially dead, and it
didn’t receive an official port. In 2002, one version was developed for the
annual Minigame compo, a coding competition with strict size targets. The 1
kilobyte large Zapactris (taking its name from programmer Anders “Zapac”
Carlsson) is a fairly faithful replica of the original, albeit without the
additions of some Tetris variants, such as bonus points for eliminating
multiple lines, etc.