After you've beaten the game, you'll unlock Flip Mode, which flips the entire game vertically.
By completing all the in-game intermission levels, you can replay them any time via Intermissions Mode.
You can unlock different theme music for the jukebox by collecting trinkets.
You can unlock different theme music for the jukebox by collecting trinkets.
If you achieve an S-Rank or above in at least four time trials, you can unlock the No Death Mode. Doing so gives you the challenge of playing the entire game without dying once.
If you collect all twenty trinkets and talk to Victoria, you'll gain access to The Secret Lab, which includes the Super Gravitron and the trophy room.
By completing certain tasks in the game, you can unlock competitive time trial versions of the levels.