Exact by design
Wins use exact rational arithmetic. No floating-point guesswork or tolerance.
Expression puzzle for iPhone + iPad
Make 24.
Beautifully.
Combine four number tiles using exact arithmetic, square roots, factorials, and degree-mode trigonometry. Every original number is used exactly once.
1
3
4
6
6 ÷ (1 − 3 ÷ 4)= 24
Why 24++
A puzzle table, not a calculator.
Classic to geek
Explore Classic, Transform, and Trig labs with operator rules that stay clear and finite.
Built for exploration
Tap or sweep across tiles, undo freely, reveal progressive hints, and compare your operation count.
Free + Full Lab
Start with 24 free puzzles.
A one-time Full Lab purchase unlocks every validated puzzle currently in the 1–13 bank, including future bank updates. Family Sharing and Restore Purchases are supported through Apple.