Find the tile that's a different shade — in green.
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 green spectrum — from yellow-green to emerald to deep forest green.
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.