🎯 Odd One Out
One tile is a slightly different shade. Find it before the grid grows again.
LEVEL 0BEST 0TIME 0
How to play Odd One Out
- The grid fills with tiles that are all the same colour, except one.
- Tap the tile whose shade is slightly different.
- Each correct find grows the grid and shrinks the colour difference.
- The clock is always running, and a wrong tap costs you time.
Controls
| Input | Action |
|---|---|
| Click / tap | Select a tile |
| P | Pause and resume |
| F | Enter or leave full screen |
| Esc | Leave full screen |
Tips & strategy
- Let your eyes go slightly out of focus. The odd tile tends to pop out of peripheral vision before you consciously find it.
- Scan in rows rather than jumping around randomly — it is faster and you will not re-check the same area twice.
- Turn your screen brightness up. At high levels the difference is only a few percent of luminance.
- If you truly cannot see it, tap anyway — the small time penalty is cheaper than stalling.
Frequently asked questions
How far can the levels go?
The grid grows to a maximum of eight by eight, after which only the colour difference continues to shrink, so the ceiling is your eyesight rather than the board.
Is this a real colour vision test?
No. It is a game, not a diagnostic. If you suspect a colour vision deficiency, see an optician for a proper Ishihara test.
Does screen quality matter?
Yes, noticeably. An OLED or a well-calibrated display will show the later levels far more clearly than a dim laptop panel.