unlockable bonus game
C55372
concept
An unlockable bonus game is a hidden or extra game mode that becomes accessible only after meeting specific in-game conditions or achievements.
Observed surface forms (1)
- bonus stage ×2
Instances (3)
- Green Switch Palace via concept surface "bonus stage"
- Forest Secret Area via concept surface "bonus stage"
-
Sonic Mega Collection Plus (as an unlockable in some regions)
surface form: Sonic Mega Collection Plus