Make 24 from four numbers with + − × ÷. Four modes, graded difficulty, offline.
Make 24 from four numbers.
TwentyFour is a math puzzle built around one rule: take four numbers and use
+ − × ÷ with parentheses to reach exactly 24.
Four ways to play
Free mode. Look up a hint whenever you want, take as long as you like, and
jump to the next puzzle whenever you like. A good place to learn the ropes or
to explore how different card sets behave.
Timed mode. Play endlessly, or set a limit of 1, 3, 5, 10, 20 or 30 minutes.
Asking for an answer starts a 30-second cooldown and puzzles cannot be
skipped, which turns a run into a test of speed and accuracy. Every run ends
with a summary: puzzles cleared, total time, average time per puzzle and your
fastest run so far.
Search mode. Type any four numbers from 1 to 13 and the solver lists every
answer it can find for that card set, together with a difficulty score.
Book mode. Keep the puzzles you like, come back to them later, and mark them
solved or delete them.
Difficulty that actually varies
Every puzzle is scored from its own solution set - how many answers it admits
and how often parentheses are needed - and then sorted into Easy (many
solutions), Medium (balanced) and Hard (a single solution). Pin one tier, or
choose Random for a fresh mix on every round.
Made to be pleasant to use
- Light and dark themes, either following the system or pinned in the app
- Haptics for taps and for right and wrong answers, plus an optional sound
- Undo and redo, and keyboard shortcuts for tablets and Chromebooks
- 21 languages, including right-to-left Arabic
- Statistics: puzzles solved, total and average time, fastest puzzle, hints
used, and personal bests for each difficulty
Privacy
There is no account to create, no advertising, no analytics and no network
access. Everything you do stays on your device, and the app does not
collect, send or share personal data. The privacy policy has the details.