A thoughtful number puzzle
Smart 24
Four numbers. One target: 24. Find your own path with arithmetic, insight, and a little persistence.
Work through 1,040 solvable puzzles across 26 chapters, reveal a step-by-step route when you need inspiration, or chase a new best in a 90-second time attack.
Preparing for Google Play
How it works
Four numbers. Exactly 24.
Simple rules leave room for clever ideas.
- 01
Pick a number
Start with one of the four cards.
- 02
Choose an operation
Select +, −, ×, or ÷, then pick a second card.
- 03
Make 24
Keep combining results, using every original card once.
In the game
A look inside.
About Smart Hippo