Purchase an Alternate Soundtrack from the Perk Shop.

Purchase a Player Character from the Perk Shop.

Complete Arcade Mode in 1-Hit Kill mode.

Earn 350,000 points in a single playthrough.

Complete Stage 8 in Story Mode.

Complete Stage 6 in Story Mode.

Complete Stage 4 in Story Mode.

Complete Stage 2 in Story Mode.

Purchase something from the Perk Shop.

Complete Arcade Mode.

Defeat the Devil Worm in Arcade Mode Stage 5 without dying.

Defeat Gromaides in Arcade Mode Stage 3 without dying.

Defeat the Mutant Lieutenant in Arcade Mode Stage 2 without dying.