Challenges are default Story Act with added difficulty, but also extra rewards. You must have the Story Act complete for the world to enter the Challenge.
Challenges change every 30 minutes
Information
These are the available Challenges
- Tank Enemies - Enemies have more Health and Armor
- High Cost - Units cost 1.5x higher to upgrade and place
- Shield Enemies - Enemies have 1 additional instance of shields.
- Regen Enemies - Enemies Regenerate health over time (except Flying enemies)
- Short Range - All Units have a 2/3 shorter range
- Fast Enemies - Enemies move faster
These are the Challenges that are only available at Demon Academy Portal
- Hyper-Regen Enemies - Enemies Regenerate even more health over time (except Flying enemies)
- Flying Enemies - All enemies are Flying (enemies that can regen still can regen)
- Steel-Plated Enemies - Enemies have thrice the health, and have 20 additional instances of shields.
- Godspeed Enemies - Enemies move even faster.
- Mini Range - All Units have a 1/4 shorter range. Note that units' AoE aren't affected, making the likes of Hybrid Units or any unit with extreme AoE viable.
- Triple Cost - Units cost 3x higher to upgrade and place.
Regular challenges
Beating any of these Challenges can grant you the following rewards:
Daily Challenge
Beating Daily Challenge can grants you 10 to 50 
Star Remnants, 2 to 3 Stat Cube
s, and a chance for 1 Perfect Stat Cube
.
Stat Cube
Perfect Stat Cube
Enemies can have resistance or weakness for the following types:
- The main type of damage will always appear in challenges, and the secondary with some chance
 Physical
|
 Magic
|
 Dark
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 Water
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 Lightning
|
 Light
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 Fire
|
 Air
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 Ice
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Trivia
- Daily Challenges used to include the ones only available at Demon Academy portal, but was excluded.
- Hyper-Regen Enemies used to include flying enemies to regen, but was removed.