Number Rush — a free Schulte table speed test in your browser

Twenty-five numbers, scrambled across a 5×5 grid. Tap 1, then 2, then 3, all the way to 25, as fast as your finger and your eyes can find them. Your time is your score, so lower is better — and because a wrong tap adds two seconds, going faster than you can actually see doesn't pay.

The clock doesn't start on page load. It starts the moment you tap 1, so you can look at the board for as long as you like first without it costing you anything. From there it is one continuous sprint with no levels, no lives and nothing to memorise — just you, a grid, and the number you need next. Free, no download, and it plays the same on a phone as on a desktop.

How to play

• Take your time on the first look. Nothing is running until you commit.
• Tap 1 to start the clock, then work upwards: 2, 3, 4… through to 25.
• A number you've taken goes grey but stays readable, and stops responding — so a fumbled double-tap costs you nothing.
• A wrong tap flashes red and adds 2 seconds to your final time. The running penalty is shown in the header, so it's never a surprise at the end.
• Your score is elapsed seconds plus 2 per wrong tap. Fastest total wins, and your top 5 is kept on this device.

This is a Schulte table — and the trick is to stop looking

The grid isn't an arbitrary layout. It's a Schulte table, named after the German psychiatrist Walter Schulte, who used scrambled number grids in the mid-20th century as a simple bedside measure of attention and visual search. It has been a fixture of attention-training and speed-reading exercises ever since, largely because it needs nothing but a pen and paper and produces a single honest number: how long you took.

The instruction that comes with a Schulte table is always the same and always sounds wrong: fix your gaze on the centre cell and don't move it. Find the numbers with your peripheral vision instead. The reason is arithmetic. Your eyes don't glide across a scene — they jump, in saccades, and between jumps they park in a fixation lasting roughly 200 to 300 milliseconds. Vision is actively suppressed during the jump itself, so a scanning strategy spends real time blind. Hunt for all 25 numbers by moving your eyes and you have paid for at least 25 fixations — five to seven seconds of pure eye-parking — and in practice far more, because you re-scan tiles you've already looked at without realising.

Hold your gaze at the centre and the whole 5×5 grid falls inside what researchers call the useful field of view: the area from which you can pull information in a single glance. Acuity drops sharply away from the fovea, but a large bold digit against a plain tile is exactly the kind of high-contrast, low-detail target that survives that drop. You aren't reading the outer tiles so much as recognising their shape — and you already know what you're looking for, which turns the task from reading into matching.

Two practical consequences. First, your first few runs will feel slower with central fixation than without it, because you're overriding a reflex; the payoff comes after a handful of attempts, and it's worth pushing through. Second, once the eyes are still, the bottleneck moves to your finger — which is why the last five numbers, spread across a mostly-grey board, often take longer than the first ten.

Worth saying plainly: this is a game and a bit of self-competition, not a diagnostic. A Schulte time varies with your screen size, whether you're using a thumb or a mouse, and how awake you are, and there's no good evidence that drilling one makes you a faster reader of actual text. Chase your own personal best and enjoy it for what it is.

More games

More tests of eyes and fingers: Chimp Test hides the same kind of grid the moment you start, Aim Trainer measures how precisely you can land a tap, and the Reflex Test strips it down to a single millisecond count. Or browse all games.