Finish with 8 minutes (or more) remaining on the Doomsday Timer

Revive a hero

Complete a level with zero seconds left on the clock

Complete your first room

Complete 88 Mode with 16 heroes remaining

Complete the Space Station

Complete the Volcano

32 Perfect rounds

Score 888,888 points

8 Perfect rounds

Score 8,888 points

Kill 8 enemies in one game

Kill your first enemy