The Cthulu is an enigma wrapped in a mystery, sealed inside a puzzle shaped cube. The Cthulu is not only the hardest and most devious labyrinth puzzle developed by Inside3, they went one step further and threw away the map! As part of their infamous ‘Phantom Series’, the Cthulu demands that the player listen and feel intently to the movement of the ball, exploring all possible avenues within the darkness of the chamber. Is it possible? Yes…but you may be here a while. Manufactured in France to impeccably high standards and presented in Inside3’s signature, fun packaging. The ULTIMATE Inside3 challenge.