This puzzle is similar to a Tic-Tac-Toe game. It is actually much better than Tic-Tac-Toe. It's not just an electronic version of Tic-Tac-Toe, the difference is that the moves you have placed before will disappear. This will force you to remember every moves you made and think ahead by considering which light will disappear. It's much more challenging than the Tic-Tac-Toe. It has two levels of challenging -- Novice & Expert. A very nice game. When I first played this game, I lost again and again ... until I learned to memorize the moves (both players'). You will not be disappointed!!! This puzzle is used but it is in good condition and all lights are working.

An electronic copy of user's manual is available. Guaranttee no DOA (Dead On Arrival).