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Guides
Classes, bosses, events, systems — everything you need to master the realm.
Devil Square
Devil Square Event Guide
Devil Square is the ultimate survival challenge in Mu Online. Waves of monsters will spawn continuously, and your goal is to survive until the end while racking up as much experience as possible.
How to Enter
To enter Devil Square, you need a Devil's Invitation.

- Crafting the Ticket: Combine a Devil's Eye and a Devil's Key of the same level with a Chaos Jewel at the Chaos Machine.
- Daily Limit: You can enter Devil Square a maximum of 3 times per day.
- NPC: Speak with Charon in Noria or Event Square to enter.
- Notification: You can also click the event icon when it appears.
Level Requirements
| Devil Square Level | Required Character Level |
|---|---|
| 1 | 50 ~ 130 |
| 2 | 131 ~ 180 |
| 3 | 181 ~ 230 |
| 4 | 231 ~ 280 |
| 5 | 281 ~ 330 |
| 6 | 331 ~ 400 |
| 7 | Master Level 400+ |
Gameplay
- Survival: The event lasts for 20 minutes. Monsters spawn in waves, becoming increasingly difficult.
- Competition: You are competing with other players for kills and experience.
- No Penalty: If you die in Devil Square, you do not lose experience or items, but you will be warped out of the event.
Rewards & Rates
Currency Rewards
- Ruud: 1 - 10 Ruud per completion.
- Goblin Points (GP): 100 GP awarded for surviving the square.
Item Drops
- Guaranteed: Sealed Armor Sculpture (distributed via internal reward sections).
- Experience: Massive EXP gains that scale with the square level.