SunaBox - The Particle Sandbox That Remembers

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