This is a liberated game: it was originally sold as shareware, but in February 1996 author Greg Taylor released the registered version as a free download.
Puzzle, 1986Freeware
Also known as Chain Reaction
Puzzle, 1995Shareware
Puzzle, 1992Shareware, Shareware
Puzzle, 1991Shareware
Puzzle, 1993Freeware
Puzzle, 1995Shareware (installed), Shareware
Puzzle, 1994Shareware (installed), Shareware
Puzzle, 1994Shareware
Puzzle, 1996Shareware (installed), Shareware
Puzzle, 1993Shareware (installed), Shareware