This is a liberated game: originally it was sold as shareware, but in 2005 author Mike Voss released the full version as a free download.
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
Puzzle, 1993Shareware (installed), Shareware