There are several events that don’t appear on the event screen at first and appear after meeting certain requirements.
Format:
Event Name/Number
Unlocking Method
Events 11-20
Complete 7 events
Events 21-28
Complete the Subspace stage in the Subspace Emissary
Events 29-40
Unlock all hidden characters
Co-op Events 9-13
Complete the Subspace stage in the Subspace Emissary
Co-op Events 14-20
Complete 10 co-op events and unlock all characters
Co-op Event 21
Complete all 20 co-op events
