Proof Engine Lab · free · no install

A game engine, live in your tab.

These are not videos. Each demo is Proof Engine, the Rust renderer behind our game O'BLOCK, compiled to WebAssembly and drawing with WebGL2 right here. Turn things, type things, then save what you make as a PNG.

Voxel sneakers from O'BLOCK turning live, drawn by Proof Engine

Live engine loads in a moment (301 KB). This is a still from it.

Live: the engine walks the sneaker catalogue. Drag to turn it.

Pick a demo

Turn it, recolour itSneaker spinnerSpin any of 176 voxel sneakers from O'BLOCK, pick from 1043 colourways or mix your own.Your name, your paintingOne-of-one paintingType your name and get a painting nobody else gets. The same name always paints the same picture.True size, next to youMoney pileAny amount in $100 bills at real scale, stacked beside a 1.8 m person.Roll a seedOne-off objectsA one-off car, watch, sculpture or piece of jewelry built voxel by voxel from a number, plus all 37 things the game sells.

Four demos, one engine

A Jordyn 1 in Bred, a voxel sneaker drawn by Proof Engine

Turn it, recolour it

Sneaker spinner

Spin any of 176 voxel sneakers from O'BLOCK, pick from 1043 colourways or mix your own.

A seeded painting in a gold frame on a lit wall, drawn by Proof Engine

Your name, your painting

One-of-one painting

Type your name and get a painting nobody else gets. The same name always paints the same picture.

One billion dollars in stacked $100 bills next to a person, drawn by Proof Engine

True size, next to you

Money pile

Any amount in $100 bills at real scale, stacked beside a 1.8 m person.

A one-off voxel car on a lit plinth, drawn by Proof Engine

Roll a seed

One-off objects

A one-off car, watch, sculpture or piece of jewelry built voxel by voxel from a number, plus all 37 things the game sells.

What is running

301 KBthe whole engine plus the game's art code, gzipped WebAssembly

176sneaker models from the game's catalogue, 1,043 with their colourways

37flex-shop things, plus a one-off for every seed you can type

0uploads: every pixel is computed on your device

The art is O'BLOCK's own source files (sneakers, paintings, the money room, the flex shop), compiled unchanged. The engine draws every picture as a cloud of glyph particles into half-float HDR targets, then runs the same bloom, tone map and colour grade as the game. On the desktop it opens a window with OpenGL 3.3; here the canvas is the window and WebGL2 is the context.

If your browser has no WebGL2 you will see a still from the engine instead. Chrome, Edge, Firefox and Safari 15 or newer all run it live.