The Nuclear Puzzle. Amazing 100 piece puzzle with full in game controls. Some advanced piece shapes in this puzzle so ths game is really aimed for intermediate to advanced players seeking a puzzle game. Novices as well as beginers will have lots of fun although the complexity of the game will still be there so excpect spending extra time solving the puzzle. The game will default back to its start setting once the game has been completed. You may use your mouse to rotate pieces to fit into your puzzle as you play the game. pull up the finished image iff you get stuck and need some clues. Preview image will pop up in the game play screen and this can be closed out when you nolonger need it. Ghost image facility enabled to pull upan image overlay of the finished puzzle image. This will fix the center of your screen and give you a guide to solve the game. Options during play to pause the game or start over again. The game works on all major Windows platforms such s XP and Vista (both 32 to 64 Bit). All the files necessary to play the puzzle in a neat package. Just click to play and the puzzle will run automatically. No time restrictions or any limits on the number of time you can solve the game on this puzzle software you may play it as many times as you desire. If you are really into complicated puzzles it seems that you just stumbled upon a really challenger here. Just have fun and pass it on to any family members or friends.