How to play
- 1
A grid of tiles appears — one tile is a slightly different color.
- 2
Tap the odd tile before the timer runs out.
- 3
Each success makes the difference subtler; a miss or timeout ends the run.
What this test measures
This game measures visual attention and color discrimination. You scan a growing grid for one mismatched tile as the hue and lightness gap shrinks under a tightening timer.
Score guide
| Grade | Range |
|---|---|
| Eagle Eye | 25+ levels |
| Sharp | 18–24 levels |
| Good | 12–17 levels |
| Average | 7–11 levels |
| Beginner | 3–6 levels |
| Novice | 0–2 levels |
FAQ
- How is the score counted?
- Your score is the number of levels you clear in a single run. A miss on the first tile scores 0.
- What ends a run?
- Tapping a matching tile, or running out of time on a level. There is no cash-out — it is sudden death.
- Does it get harder?
- Yes. The grid grows to 5x5, the odd tile gets closer in color, and the timer keeps shrinking past level 24.
- Is this a vision or color-blindness exam?
- No. It is a free attention game, not a medical or diagnostic test.