There are currently 10 challenges in the game, each of which modify how the game looks or plays.
|Retro Run||Makes the game extremely pixelated, centers the gun on the screen and the player starts with maxed speed stat.||Unlocked by default|
|Boss Rush||Fight all the bosses except Fafnir and Nidhogg in a single challenge room in quick succession. Bosses do not drop loot, health or upgrades. Bosses can have modifiers.||Defeat Nidhogg[verification needed • edit • ?]|
All weapons are fully automatic and the player is permanently under the effects of the Battle Lion Shield.
Should the player find a Battle Lion Shield during a run, all cooldowns will be further reduced by another half, although weapons cannot fire faster than quarter-beats and abilities cannot be used faster than half-beats.
|The Floor is Lava||
The player is granted Odr's flight and movement mechanics, but otherwise still starts with the default challenge equipment and health.
Any surface the player can walk on will rapidly deal damage in increments of 5 points and displays a lava effect when approached, similarly to the Frozen level modifier.
|Complete Svartalfheim 2 on Hard difficulty|
|Supertime||The players and enemies can only move on the beat.||Unlocked by default|
|No Shop Or Treasure||No shops or treasures will appear on the run||Spend 500 Coins at Hugginn's Shop|
|Pistol Only||You can't use another weapon besides the Pistol||Spend 250 Coins in the Armory|
|Fixed Seed Random Items||The dungeons will be fixed, but the shrines and items dropped will be random||Complete Helheim 1 on Hard difficulty|
|Fixed Seed Fixed Items||The dungeons, shrines and drops will all be fixed||Complete Helheim 1 on Hard difficulty|
|Mega Boss Rush||Fight all the bosses except Fafnir and Nidhogg in a single challenge room in quick succession. You don't have health (Like Odr). Bosses do not drop loot, health or upgrades. Bosses can have modifiers.||Clear Asgard Crypts on Hellish|