Play a minigame
An alternative interface to the Dream Jar. Only nightmares you have beaten (not just collected) as any of your characters will show up here. If you have "Enable hard mode" check off in the Options menu when you beat a nightmare, it counts as "Medium" on this screen, so this interface lets you try the nightmares in a more difficult setting than you can while playing normally as a character.
To play a nightmare, click the "Easy," "Medium," or "Hard" button beside it.