Tap Fast Square

One square is a slightly different shade. Tap it before the clock runs out. The grid grows, the colors get closer, and your eyes have to keep up.

One square does not match. Find it.

Tap Square is a pure test of color perception. A grid of squares fills the screen, every one of them the same shade — except one. Tap the odd one out and the next grid appears, a little harder than the last.

HOW IT WORKS

• Levels 1-10: a 2x2 grid, and the difference is easy to spot • Levels 11-20: 3x3 • Levels 21-30: 4x4 • Level 31 and beyond: 5x5, and the two shades keep creeping closer together

Deep into a run, the odd square sits a single step away from its neighbours. Screen brightness, glare and tired eyes all start to matter.

TWO WAYS TO PLAY

• Without Time — no clock, no pressure. Take as long as you need to be sure. One wrong tap ends the run. • With Time — five seconds per level. Answer fast and the time you did not use is added to your score. Hesitate and the run is over.

Each mode keeps its own best score, so there are two records to chase.

LIVES

You start with three lives. A wrong tap, or the clock running out, costs one of them. Out of lives? Watch a short video and get five more.

WHAT YOU GET

• No account, no sign-up, no tutorial to sit through • Plays offline — only the optional reward video needs a connection • One tap to start, and a run can be over in thirty seconds • Built for iPhone and iPad

How far can your eyes take you?