In the amazing Mickey Mania - The Timeless Adventures of Mickey Mouse you must take Mickey on an epic journey to travel through his previous cartoon environments to do battle with a variety of bad guys by either jumping on them or tossing marbles at them to take them down. Starting with 5 lives, you can lose them quickly to keep your eyes peeled for stars to help replenish them.

For more great games from this cool genre, Rayman 2 - The Great Escape, Rayman and the great collection at Namco Museum Vol. 1 are all solid examples. If you'd just like to see other titles from the retro-tastic system then you might want to get on over to explore the Sega CD archives.