Qb
Qb is a homebrew puzzle-action game for the Atari 2600 by Andrew Davie, released by XYPE in 2001. A small hopping character rearranges blocks on the playing field to copy a pattern, while fruit, eggs and monsters get in the way. Davie first wrote the game for the Atari 800 computer in 1984 and brought it to the 2600 many years later. You can play it here in your browser.