Build real mechanical systems in a physics sandbox where gears truly work.

Design precision machines, engineer complex mechanisms, and experiment with motion, force, sensors, and logic.

From simple contraptions to intricate mechanical systems — everything is built from parts you control.

Real Gear Simulation

Real gears that transmit motion and force without slipping.
Teeth count, size, and bevel angles are fully customizable, allowing precise mechanical systems.

Super Glue Stability

Fuse parts into a single stable structure with Super Glue.
Unlike traditional physics joints, fused structures stay rigid and stable even in large and complex machines.

Fully Resizable Parts

Resize parts freely to fit your design.
Shapes, gears, and components can be stretched and scaled without breaking physics.

Freeform Building

No grid. No restrictions.
Place parts anywhere and build machines exactly the way you imagine.

Logic, Sensors & Automation

Build intelligent machines using sensors, relays, and full logic gates.
Detect distance, motion, and signals to control mechanical systems, create programmable computers, and automate complex mechanisms.

Analog Signals

Analog signals allow smooth control and dynamic systems.

Build regulators, oscillators, and mechanical control circuits.’

Kit Assembly

Follow instruction kits to assemble complex machines step-by-step.
Perfect for learning the systems and building intricate creations.