Write Arduino-style C++ in your browser and watch your robot fight in a physics-simulated arena. Write your sketch, hit Build & Run, and the simulation reacts in real time, so you iterate faster and ship better code.
Pick a scene, load a starter sketch, and start iterating. New arenas drop regularly.
LIVE
Push your opponent out of the ring. Edge sensors, proximity, and pure aggression.
Open in simulator →Tune a PID loop and chase the line through curves, gaps, and forks at speed.
Map the walls, remember the path, and beat your own time on the second run.
A full Arduino-style IDE on the left, your robot fighting in the arena on the right. Change a constant, hit Build & Run, watch the behavior change instantly.
Real setup() / loop() C++ with pins, sensors, and Serial.
Compiles to WebAssembly in your browser — no toolchain, no upload, no wait.
The physics sim reacts live. Read the Serial console, tweak, and run again.
Free to start. The starter sketch gives you the basics — just open it and write your strategy.
