Instructions & Help

A working two-player Tic-Tac-Toe game. This version doesn't use any lists/arrays on purpose — every cell is tracked individually so you can focus on functions and conditional logic first. Fill in the missing code in code.js, one TODO at a time.

Try each TODO yourself first. If you get stuck, use the hint button for that spot — hints start vague and get more specific. The last hint is the literal answer.

⏱ Hints are on a shared 30-second timer. Asking for a hint anywhere locks every hint button on the page — there's no dodging the wait by jumping to a different blank.

Once your game works, trace through these by hand — don't just click around in the game to find the answer. You get one attempt per question, so think before you pick.

Your certificate below is based on your Predict & Check results. It updates automatically as you answer questions.

Once the base game works and you've completed Predict & Check, try one or more of these. Nothing here is required — pick what sounds fun:

• Swap "X" and "O" for two emoji of your choice.
• Add a running score across restarts ("X wins: 2, O wins: 1") — you'll need a new variable that the restart button does not reset.
• Change the color scheme in style.css to match a theme (space, ocean, your favorite team).
• Stretch: highlight the three winning cells in a different color when someone wins (hint: you'll need to know which cell numbers made the win, not just that one happened).