Next challenge: make the board bigger, let two people play, or teach the computer to look two moves ahead.
🎮 The game so far
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📋 How this works
Each step asks for one function. The INPUT / OUTPUT / ALGORITHM comment at the top of the editor tells you everything you need — and there is a copy above it you can open any time.
Press ▶ Test it to run real checks. Every ❌ says what it expected and what it got.
When all the tests pass, the next step unlocks and the demo switches to your code.
Your work is saved in this browser, so you can come back later.
⚠️ A loop that never stops is caught after 2 seconds and reported as a mistake.