Free brain-training game
About Number Stairs
Number Stairs is a number-sequence puzzle game: read the pattern in a short series and pick the value that comes next to climb the staircase. Beat the timer on every step — arithmetic, geometric, growing-gap, square and Fibonacci-style patterns all unlock as you go, so you have to hold the sequence in mind and reason about it fast.
How to play Number Stairs
- 1Read the number series shown above the stairs (for example 3, 6, 12, 24, ?).
- 2Work out the rule connecting the numbers — a constant step, a ratio, or a growing gap.
- 3Tap the choice with the correct next value before the per-step timer runs out.
- 4One wrong pick ends the climb; longer sequences and new pattern types arrive as you rise.
What Number Stairs trains
Number Stairs is a working memory workout — your brain's 'RAM'. You hold several terms in mind at once, test a rule against them and project it forward, which strengthens how much information you can juggle without losing your place.
Learn about Working Memory Exercises and Games for Adults →Tips & strategy
- Check the difference between consecutive terms first; if it's constant, it's arithmetic.
- If the numbers grow fast, test for a ratio (×2, ×3) before anything else.
- When the gaps themselves grow, look for +1, +2, +3… style patterns.
Frequently asked questions
What kinds of number patterns appear?
Arithmetic (constant step), geometric (constant ratio), growing-gap, perfect squares and Fibonacci-style 'add the last two' sequences all show up as you climb.
How does Number Stairs train working memory?
You have to keep several numbers active in mind, deduce the rule and apply it before the timer expires — exactly the kind of hold-and-manipulate task that stretches working memory.
Is Number Stairs free?
Yes — it's a free browser game with no download required.