Visuospatial memory
Number Grid
A 3×3 grid flashes with highlighted cells. Memorise the numbers, then calculate their sum — or product at higher levels.
How to play
👁
Study the grid
A 3×3 grid flashes briefly. Remember the highlighted (dark) cells.
Σ
Calculate from memory
The grid disappears. Type the sum (or product) of the highlighted numbers.
↑
Advance through levels
3 correct in a row = level up. Grid flashes faster and more cells are highlighted.
Score distribution
3,860 players · all sessions
- Lvl 1–31,230
- Lvl 4–61,680
- Lvl 7–8740
- Lvl 9–10210
Leaderboard
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