Odd Color

Odd Color is a test of how well you can tell colours apart. Every round shows a grid of tiles in one colour, except for a single tile that is a little lighter. Find it and tap it to move on.

The first rounds are a 2×2 grid with an obvious difference. The grid grows step by step to 8×8 while the difference in shade shrinks, until the odd tile is very hard to pick out. You have thirty seconds on the clock; each correct tap gives two back and each wrong tap takes three away. Screen brightness and viewing angle really do matter here.

Tap the tile that does not match. Correct taps add 2 seconds (up to 30); wrong taps cost 3. Your score is the number of rounds cleared.