From Wikipedia: The game is in 3D but plays like a 2D side-scrolling platform game with 3D turns and camera angles in the environment and the path that George walks on. There are a total of 6 levels; 2 with a jungle theme, 2 with a swamp theme, and 2 with temple theme. All 6 levels are made to look like the cartoon series (the 2007 remake, not the original 1960s version). The secret alluded to in the game's title is never explained.