"Lost Levels" Deep within Super Mario Bros. 3 lie hidden, unused levels. Some of them seem polished, with working goals and plenty of enemies, while others are devoid of enemies, lacking exits, or too short to be full levels. Whether they evolved into other levels, or were merely used for testing, the "lost levels" provide an interesting glimpse into the development of Mario 3. Lost enemies The lost levels contain two enemies not present in the regular levels: Gold Cheep Cheeps, and Green Parabeetles. The Gold Cheep Cheeps come in groups and swim faster than regular Cheep Cheeps. The Green Parabeetle is basically a red Parabeetle that flies faster.