From Sonic Retro
Template:SA2Level Crazy Gadget is the 15th stage in the Hero story of Sonic Adventure 2. It takes place primarily on ARK's interior, and fulfills the role of "gravity-changing contraption" for the game. Perhaps the most iconic imagery of the level is the colored block puzzle found in the final room.
Big the Cat Location
At the end, among the colored block complex, Big is standing on the left side of the yellow block, though it's an indented part of that block, located close to the front. You can see Big while attempting to get on the ring-laden rail from the yellow block to green. Jumping from the south corner of the yellow block as soon as you first land on it will allow a better look. In Hard Mode, he changes position to the underside of the blue block.