Mystery Word
Six tries to crack the word of the day.
Guess the hidden word of 5 to 7 letters in six tries: each guess shows which letters are in the right spot, in the wrong spot or absent. Alone, or in a race against the AI on the same word.
- Players
- 1 player
- Length
- 5 min
- Against the AI (Race against the AI)
- Solo
15 days of full access, no account · No download
How to play
Goal
Find the mystery word in six tries or fewer. Its length (5, 6 or 7 letters) depends on the level. The words to find are common nouns, verbs and adjectives.
How it works
- Type a real word of the right length, then submit with Enter.
- Each letter flips over: green if it is in the right spot, gold if it appears elsewhere in the word, grey if it is absent (or already counted).
- The keyboard changes colour as you play to help you.
- Diabolical level: strict mode, every green letter must stay in place and every gold letter must be reused.
- Word of the day: the same word for everyone that day, at each level.
Race against the AI
The AI looks for the same word as you, one try at a time. After each of your tries, its row lights up (without showing its letters). Whoever finds the word in fewer tries wins; on a tie, it is a draw.
About the AI
For each possible guess, the solver works out the spread of colours it would produce across all the words still possible, then picks the one that brings the most information (Shannon entropy, in bits), with a slight bonus if it could be the solution. The hint uses the same calculation. At Diabolical level, the AI knows the list of mystery words for that level (never the solution itself). In the lower race levels, it simply picks possible words at random, sometimes forgetting misplaced letters at Easy level.
Difficulty levels
- Easy5-letter words among the most common. In a race, the AI is distracted: it often forgets misplaced letters.
- Medium5-letter words. In a race, the AI guesses at random among words that are still possible.
- Hard6-letter words. In a race, the AI maximizes information, guessing only possible words.
- Expert7-letter words. In a race, the AI maximizes information across its whole vocabulary.
- DiabolicalLess common 7-letter words, strict mode: every revealed clue must be reused. In a race, the AI plays as well as it can.
