Ping
Convert all of the Yellow dots to Blue dots.
Links
The SIGMA and SIGMA+ Games Matthew Baker
Merlin's Magic Square
Fiver
Lights Out by Jaap Scherphuis Jaap's Puzzle Page
Puzzles - Fiver Tcl/Tk programs by Felipe Voloch
Merlin's Magic Square
Fiver
Lights Out by Jaap Scherphuis Jaap's Puzzle Page
Puzzles - Fiver Tcl/Tk programs by Felipe Voloch