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SunaBox - The Particle Sandbox That Remembers
Paint 27 kinds of matter. Set it on fire. Then press rewind. SunaBox is a physics sandbox in the spirit of the legendary OE-CAKE, on a bit-exact engine: every session can be replayed, rewound, saved, and shared to reproduce your world perfectly.

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Features
Single-player
Family Sharing
Profile Features Limited 
Languages:
Interface Full Audio Subtitles
English ✔
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About This Game

In 2007, Prometech released OE-CAKE! It was supposed to be a technology demo... instead, it quietly became one of the internet's favorite physics toys.

SunaBox is a love letter to that toy and its community: a clean-room successor, rebuilt from scratch, that opens your old .oec files and keeps going where 2007 could not.

🖌️ Paint in 27 shades of matter

Water, gel, oil, mercury, acid, nitro, rice, rubber, wood, stone, metal, ice,

lava, fire, smoke, steam and more. Every material behaves differently. Ice

melts. Wood burns to ash. Steam condenses. Nitro does... what nitro does.

⚙️ Machines that really run

Weld strokes into rigid bodies, pin them on axles, drive them with jets,

stretch rubber into slingshots, or take the controls yourself. The arrow keys

can drive what you paint.

🖼️ Drop in any PNG and it becomes matter

Your drawing. Your logo. A photo of your cat. Rigid. Liquid. Flammable.

Whatever you choose. Old OE-CAKE .oec scenes open too, preserved

exactly.

⏪ The sandbox that remembers

The engine is deterministic and bit-exact, so a session is a starting state plus your inputs.

Replay it, scrub it backwards, share it as a file that provably reproduces

the same world, bit for bit. No other physics toy can say that.

🕹️ OE-CAKE Classic mode

One toggle and the toolbar becomes OE-CAKE's, laid out exactly as you

remember it. Same toolbar, same buttons, same order, same muscle memory,

fifteen years later.

Features at a glance

  • 27 paintable materials with real thermodynamics

  • Rigid bodies, axles, jets, drivable machines

  • Perfect replays and smooth rewind on a deterministic engine

  • PNG import and faithful .oec import

  • Lightning, drains, collectors, orbies that really swell

  • Classic OE-CAKE interface built in

  • Open-source engine (AGPL) - SunaEngine

  • Steam Deck, Windows, macOS and Linux

System Requirements

Windows
macOS
SteamOS + Linux
    Minimum:
    • OS: Windows 10 64-bit (version 1903 or newer)
    • Processor: Any 64-bit dual-core, 2015 or later
    • Memory: 4 GB RAM
    • Graphics: Direct3D 12 capable GPU with current drivers (most GPUs 2016+: Intel HD 500-series, NVIDIA GTX 900-series, AMD RX 400-series or newer)
    • DirectX: Version 12
    • Storage: 500 MB available space
    Recommended:
    • OS: Windows 11 64-bit
    • Processor: Quad-core, 2018 or later
    • Memory: 8 GB RAM
    • Graphics: Any dedicated GPU from 2018 onward
    • Storage: 500 MB available space
    Minimum:
    • Requires an Apple processor
    • OS: macOS 13 Ventura
    • Processor: Apple Silicon (M1+)
    • Memory: 4 GB RAM
    • Graphics: Metal (All Apple Silicon)
    • Storage: 500 MB available space
    Recommended:
    • Requires an Apple processor
    • OS: macOS 14 Sonoma or Newer
    • Processor: Apple Silicon (M1+)
    • Memory: 8 GB RAM
    • Storage: 500 MB available space
    Minimum:
    • OS: SteamOS 3 (Steam Deck) or a modern 64-bit distro (Ubuntu 22.04+ equiv.)
    • Processor: Any 64-bit dual-core; Steam Deck APU or better
    • Memory: 4 GB RAM
    • Graphics: Vulkan 1.1 capable GPU with Mesa 22+ / current drivers (Steam Deck RDNA2 qualifies)
    • Storage: 500 MB available space
    Recommended:
    • Processor: Steam Deck or a quad-core desktop
    • Memory: 8 GB RAM
    • Graphics: RDNA2 / equivalent or better
    • Storage: 500 MB available space
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