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Endless Castle: Under Siege
In this idle castle defense game, recruit over 40 unique heroes, freely build powerful formations, and fend off wave after wave of enemies! Progress even while idling, and enjoy the fun of growth with ease.

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Features
Single-player
Steam Cloud
Family Sharing
Profile Features Limited 
Languages:
Interface Full Audio Subtitles
English ✔
Simplified Chinese ✔
Traditional Chinese ✔
Japanese ✔
Korean ✔
This game is not yet available on Steam

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About This Game

Game Description

Deeply blending the classic elements of idle and tower defense games, this game offers rich hero and equipment build options. Hands-free and hassle-free, enjoy the joy of strategic combination and effortless growth!

Please Note

This game contains extensive equipment grinding elements. Players who do not enjoy grinding for gear are advised to purchase with caution!!!

Game Features

  • Auto Battle
    Fully hands-free with auto-battle mode — level up and hunt for loot at the same time.

  • Numerous Heroes
    40 unique heroes allow you to build diverse lineups and explore various playstyles.

  • Hero Equipment
    Random combinations of dozens of ability affixes make every drop and forge a moment of anticipation!

  • Varied Modes
    Beyond idling, enhance your overall strength through colonies, dragon battles, expeditions, fortresses, and other distinct gameplay modes.

  • Stress-Free
    No penalties for defeat — simply wait for your power to grow and try again. No enemy is unbeatable!

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

The store page utilizes AI-assisted generation for some of its assets and decorative icons. All such materials have been manually selected and post-processed to ensure they best represent the game's style.

System Requirements

    Minimum:
    • OS *: Windows 7 (SP1+) , Windows 10 and Windows 11
    • Processor: x86, x64 architecture with SSE2 instruction set support.
    • Memory: 4000 MB RAM
    • Graphics: Integrated graphic cards or above.
    • Storage: 300 MB available space
* Starting January 1st, 2024, the Steam Client will only support Windows 10 and later versions.
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