Stack a fortress on the back of a giant beast, then watch it fight. Every block has weight: break a support and everything it held comes crashing down. A cute voxel auto-battler roguelite with three beasts, giant bosses and a campfire story.
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Match strength key:80+65+50+<50Castle Back
SteamAbout Castle Back


Castle Back is a single-player voxel auto-battler roguelite. Every fortress rides on the back of a giant wandering beast. Buy blocks, stack them on your beast's back and send it into battle. Once the battle starts, your fortress fights on its own: you win or lose by how you built it.

Nothing floats, and nothing is free to stack. Each block carries the load above it, and a block that carries too much gives way before it breaks. Hit the supports and everything they held falls: blocks crash down, crush what is below, and every falling block damages that fortress's Heart.





From your first camp on, feed your beast between fights and it grows: a new floor, or a wider back.

The Mason Turtle Queen rebuilds what you break. The Cloud-Eating Sky Whale floats above your low guns. The Rotten Citadel of the Cradle stands on roots that heal its Heart. Each one asks for a different fortress.


Cross a world that already fell, three acts to the end of the road. Between expeditions, Anvil, Barley and Whistle share their stories by the campfire, one chapter at a time, 18 in all. Each chapter opens something new: blocks, the mammoth, new roads. Keep playing and the Daily Challenge and fortress-code duels open up; after the ending, Collapse levels 1–5 make the road harder.

Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.
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