To unlock the last costume you must beat the game.
Unlockable How to Unlock Destroyer Thor Beat the game on any difficulty
Unlock Ragnarok! (very hard)
Beat the game to unlock the last difficulty in the game.
Unlockable How to Unlock Unlock Ragnarok! Beat the game
Unlock The Rune of Surtur's Flame
Beat the game to unlock The Rune of Surtur's Flame, an upgrade that causes Mjolnir to constantly burn with Surtur's Flame, doing more damage to enemies.
Unlockable How to Unlock The Rune of Surtur's Flame Beat the Game
Contributed By: Bad_Panda.
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