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Cookie Code

A word-guessing game for the whole class on one screen. The teacher sets a secret word; the class calls out guesses, the teacher types them, and the tiles show which letters are right.

Play Cookie Code ↗

Two guesses on the board, TRAIN and CLASP, with coloured tiles and an on-screen keyboard.

3–5letters in the secret word

4–6guesses, one more than the word's length

57automated tests passing

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'Set the secret word': five hidden letters with a Peek button. — **Set the word.** Letters stay hidden as the teacher types, with a Peek button to check.

'Code cracked!' The secret word PLANT, cracked in 3 of 6. — **Cracked.** The next word can be typed straight onto the result card.

A small first version

Cookie Code was written in one evening, 15 September 2026, from a design handed over beforehand: eight commits, each with a Claude co-author line. It has had no changes since.

By design it has no teams, scores or sound, and keeps nothing between visits. The game rules live outside the screens so the tests can check them, including the standard rules for repeated letters.

Measured, 7 October 2026

Lighthouse Performance 100 on desktop and 99 on mobile; 174 kB for the whole page. Builds clean, with no lint problems.

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