There is an unused alternative version of the background music that plays during the Egypt levels, hidden in the ROM of the game.
Contributed by Dazz
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.
Contributed by Dazz
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.
Contributed by Dazz