Idle Master- 3D AFK Arena

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Version update 3.10.1:
1. New game system: Formation Training.
2. Book: Underfire Demon King into the Book;
3. Eternal Tower: increase to 2000 levels and reduce the difficulty of the challenge after 1500 levels;
4. Main battle story increased by 10 chapters, a total of 200 levels;
5. Ease of use optimization and bug fixes;