Time left: 5 | Level: 1
A grid of tiles appears. One tile is slightly different in color (ΔE = color difference). Tap the odd one before the timer runs out.
Each level gets harder: ΔE decreases (colors get closer), and grid size increases.
ΔE (Delta-E) measures the difference between two colors. ΔE > 2 is usually noticeable. ΔE < 1 is almost impossible for most humans to see.
If you can spot tiles at ΔE < 1, you may have superhuman color vision 👀.