After-Game Specials
     You just need to clear the game once to unlock these.

Boss Missions/Revisits: Clear the game once.
     Easy Findings For Secret Maps: Clear the game once. Then go to an
area with the map symbol on it.

100% Completion Bonuses
     Reach 100% completion rating to receive bonuses. 
Note: You do not receive a gift for completing all of the stages.

Missions 100%:      Final song unlocked in Media Room (Ending)

Treasure 100%:      Wario's room gains gold decor and throne