If the game prompts you to press Z and nothing happens, press Y instead. This is a German game, and the German keyboard layout swaps Z and Y (Z being a way more frequently used letter in German words).
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