Build the most intricate marble tracks ever with GraviTrax The Game: Impact! With 30 puzzles to master, and the Hammer accessory for maximum brainteasing, you'll be endlessly entertained – and challenged. Construct your track with the pieces given, stretching your spatial and logic skills. And you can take your puzzles on the go for a hearty dose of brain-building fun anytime, anywhere! Whack your way to victory with GraviTrax The Game: Impact!