There is an unused alternative version of the background music that plays during the Egypt levels, hidden in the ROM of the game.
The Genesis version also included a three-player mode, not found in any other versions. Using a multitap, Player 1 controls Erik, Player 2 controls Baleog, and Player 3 controls Olaf.
The Genesis version included 5 additional levels not found in any other versions of the game. 1 in Prehistoria, 2 in Egypt, 1 in the Factory, and 1 in Wacky World. This increased the overall level count up from 37 to 42.