Find the tile that's a different shade — in blue.
All tiles share the same hue and saturation — one has a slightly different lightness. Find it before the timer runs out.
Every question uses a hue from the blue spectrum — from sky blue to ocean blue to deep indigo.
Grids grow from 2×2 to 7×7 as you progress. The color difference shrinks with every round.
10 seconds per question. Time out = instant game over. 3 wrong taps and it's game over.