The VGA version is known to crash on levels 6, 9 and 11. Levels 6 and 11 can be played in CGA and EGA versions, but level 9 appears broken. Please use the code bakklske to skip right to level 10 (thanks to john82 for the tip!).
Also known as Chain Reaction
Puzzle, 1995Shareware
Puzzle, 1992Shareware, Shareware
Puzzle, 1993Freeware
Puzzle, 1991Shareware
Puzzle, 1995Shareware (installed), Shareware
Puzzle, 1994Shareware (installed), Shareware
Puzzle, 1994Shareware
Puzzle, 1996Shareware (installed), Shareware
Also known as BOB
Puzzle, 1995Full version