Grab, slide, rotate and tumble stone pieces as a little slime in a 3D puzzle game. Match faces, rearrange supports and plan your next foothold across 100 campaign levels, each with five difficulty variants.

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Download Keystones: Foundations Demo

This game is not yet available on Steam

Planned Release Date: Nov 12, 2026

This game plans to unlock in approximately 6 days

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About This Game

Guide a small slime through 3D stone puzzles. Grab and rearrange pieces to cover targets, open gates and find a way forward. A piece's position and orientation can change the route available to you.

Grab, slide, rotate and tumble

Different pieces let you slide, rotate or tumble them. A turn can swing a long shape into position; a tumble changes which face points down. Your slime moves with the piece, so choose your grip with the next step in mind.

Find the right face

Colored supports and marked surfaces make orientation part of the puzzle. Tumble a piece to change its bottom face, then work out how to bring the right color or dot pattern into place. Getting the face right can mean rethinking the route.

Keep the route open

Use pieces as steps or supports, move them aside to make room and return to them when another part of the puzzle is ready. A piece already on its goal can still be useful elsewhere. Plan where your slime can stand, grab and release.

Features

  • 100 campaign levels, each with five difficulty variants.
  • Undo recent moves or restart a puzzle to try another approach.

AI Generated Content Disclosure

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

AI was used for texture patterns and code assistance. All content was manually verified and optimized.

System Requirements

Windows
macOS
    Minimum:
    • Requires a 64-bit processor and operating system
    • OS: Windows 10 (64-bit)
    • Processor: Intel Core i5-4670K / AMD FX-8370
    • Memory: 4 GB RAM
    • Graphics: NVIDIA GeForce GTX 1050 Ti / AMD Radeon RX 570
    • DirectX: Version 12
    • Storage: 3 GB available space
    • Additional Notes: Will be updated soon
    Recommended:
    • Requires a 64-bit processor and operating system
    Minimum:
    • OS: Will Update
    Recommended: