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Super Mario Bros. 1-1

Because 1-1 needs to be in every game. A pretty easy level made for fun. To access the undeground stand on the pipe for a few seconds and you will drop down where you can find 8 red coins for a more difficult challenge (the same applies when exiting the underground, it will take a few seconds for the ground above to disappear to let you through). Also for a bonus challenge try collecting all the coins and power-ups.

NOTE: If you experience crashing, disable ghosts in the pause menu.