The task

Twenty-five tiles, numbered 1 to 25, scattered across a five-by-five board.

Tap them in ascending order, as fast as you can. 1, then 2, then 3, all the way to 25.

The screen

Tapping the wrong tile does not end the run. It costs you the time you spent on it, and it is counted as a miss.

The technique

The instinct is to sweep the board left to right, row by row, hunting for each number. That works, and it is slow.

The traditional way to use a Schulte table is to fix your gaze on the centre tile and find the numbers in your peripheral vision, moving your eyes as little as possible. It feels impossible at first and then suddenly does not. That is the training effect the grid is famous for.

Either way is a legitimate way to play. The second one gets faster times.

Scoring

Schulte Grid is scored by elapsed time, so your personal best is your fastest run — unlike Stroop Rush, where a higher score is better. The app knows the difference and formats each game's best accordingly.

Each difficulty keeps its own best.

In Persian and Kurdish

The tiles render Eastern Arabic numerals — ۱ ۲ ۳ rather than 1 2 3 — and the board's reading order follows the language. This matters more here than anywhere else in the app, because in this game the numerals are the content.