For movement, use either the NumPad arrow keys, or QWEADZXC for 8-directional movement. To dig a hole, press and hold Shift followed by a directional key, and to fill a hole, press F followed by a directional key.
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