20Super Mario Land 2: Space Zone
Super Mario Land 2 was one of the first Mario games for Game Boy. It also saw the debut of Wario, along with some awkward levels, like this one. At least, the beautiful music made it somewhat easy to go through this crappy stage.
You can only access the Space Zone
through a soap bubble in the Hippo Stage. The problems of this zone start early on when you discover that gravity is messed up. While that allows higher jumps, it also means Mario slows down. You must choose your jumps wisely as the landings are not always as easy as they sound. Plus, as usual, you have to avoid a swarm of enemies while trying to control yourself in an awkward situation.
This level is unnecessarily strange, Mario is hard to navigate, and the spikes don't help, making it a terrible stage.