Answer the call for help

There is only one way in

Save the damsel, but is she in distress?

Successfully perform Clashes 20 times total in real battle.

Survived a Piranha Pond without a scratch!

Completed a level without taking a hit!

Earned 1 Skull Tooth.

Popped 50 Enemy Bubbles.

Chain-Bubblized 4 Enemies.

Finish a Juggernaut with a knife.

Rescue the Russian President. Complete "Down the Rabbit Hole" on any difficulty.

Earn 1 star in Special Ops Mission Mode.

Melee 5 enemies in a row.