TwentyFour: Make 24

Four cards. Four operations. One elegant answer. Build number sense through 120 handcrafted puzzles, daily challenges, and relaxed practice.

Make exactly 24 using four numbers—and discover how many elegant paths hide in simple arithmetic.

TwentyFour is a calm, handcrafted number puzzle for iPhone and iPad. Tap cards in calculation order and choose +, −, ×, or ÷ either between the two cards or after selecting both. Keep combining until one exact result remains. Every number must be used exactly once.

Features:

• 120 verified puzzles across six progressive chapters • Exact fractions and negative intermediate results • Step hints, undo, redo, restart, and full solutions • Three-star goals based on hints, time, and efficient moves • A deterministic daily challenge that works offline • Free practice with adjustable difficulty • Achievements and local statistics • Dark Mode, Dynamic Type, VoiceOver, and Reduce Motion • No ads, accounts, in-app purchases, analytics, or network connection

There is no failure countdown. Take your time, experiment, and build stronger number sense at your own pace.

Can you make 24?