Spot the cell with a slightly different color on a 5×5 grid. Each round the difference gets smaller.
A 5×5 grid shows cells of the same color — except one is slightly different.
Tap that one to advance to the next round. Each round the difference shrinks.
Wrong taps cost 2 seconds.
Goal: clear as many rounds as possible in 60 seconds.
Your eyes find a colour mismatch fastest at the edge of your vision, not the centre, so resist locking onto one cell at a time. Let your focus hover over the middle of the grid and the odd tile tends to "pop" on its own as a faint shimmer. Hard, cell-by-cell scanning is slower and gets much worse as the difference shrinks each round.
Since wrong taps cost two seconds, a confident guess is better than a frantic one but a careless stab is the worst of all. When you truly cannot tell, tilt the phone slightly or glance away and back — refreshing the image often makes the outlier jump out. And do not forget the clock: a steady stream of correct taps beats a brilliant streak that stalls on one impossible-looking board.