Level Type (Wikia Sort)

Types of Levels:
Normal: Normal level, no bosses. (Most of the levels)

Tutorial: A Level that teaches you new things. It's also used on levels which contains a Story. (E1L1)

Boss: Final boss level. (E1L11,E2L13)

Hard: Level that contains Boss or Bosses but it's not a final level.

Marathon: Level that's only one in an Episode.