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Number Puzzles

Mystery Number

One number. Several clues. Can you narrow it down?

Preparing your challenge…

Five untimed puzzles. Daily progress and personal bests save in this browser. Practice is unlimited. Hints reduce the round score by 15 points; a revealed solution earns 0. No leaderboard or online opponent.

How to play Mystery Number

Combine every clue to find the unique integer. Intervals include their endpoints. Remainder means what is left after whole-number division.

Choose Daily challenge for today’s shared set, or a practice level for a fresh set. Daily difficulty increases over five rounds. You may retry an incorrect answer; each incorrect check reduces that round’s score by 10. Hints cost 15. Reveal gives the worked solution for 0 points. Reloading resumes your daily round.