Rock to computer,
then you write the code.
Start by holding a grain of sand. Climb one rung at a time: build switches, then gates, then numbers, then a whole little computer, until you are writing real programs of your own.
🧭 How the track works
Each module is a hands-on lab that builds on the last. Finish one and the next lights up. You can wander freely, and nothing is locked, but the ladder always shows a clear next step. Your progress is saved only in this browser.