What is Concentration Grid?
Concentration Grid is a timed cognitive exercise where players find and tap numbers in sequential order (1, 2, 3...) on a randomized, expanding grid as fast as possible.
How is score calculated?
Score is awarded for each correct sequential tap, with a speed bonus for fast reaction time. Completing a full grid also grants a large clear bonus based on grid dimension.
Why do grid sizes change?
As you complete smaller grids, the board expands to larger sizes. Tighter spacing and more numbers increase visual clutter, forcing your brain to expand its peripheral scanning field.
Does the timer ever change during a session?
No. Every session runs on one fixed 45-second clock with zero time bonuses or penalties. Clearing a grid grows the board to the next size, but the clock keeps counting down the whole time — chain clears together to rack up as many grids as you can before time's up.
What happens when I run out of lives?
You start each session with 3 lives, shown as hearts in the HUD. Every wrong tap costs one life; losing your last life ends the run immediately, regardless of time remaining.
What cognitive skill does Concentration Grid actually train?
It primarily trains visual search efficiency — the speed at which your brain scans a cluttered field and locates a specific target among distractors. This relies on efficient micro-saccadic eye movements and peripheral vision rather than central foveal focus alone.
Where did the concentration grid exercise originate?
Numbered scanning grids trace back to sports psychology performance labs and are a staple warm-up in football, tennis, and combat sports training. Coaches use them to sharpen an athlete's ability to process a busy visual field quickly before switching attention to the actual game action.
Why do the numbers rotate at larger grid sizes?
From the 5x5 grid onward, each number tile is rendered at a slight random rotation. This removes the shortcut of recognizing a number purely by its shape and orientation, forcing genuine digit recognition and keeping visual search difficulty climbing alongside grid size.
How does this compare to a standard Schulte table?
This drill is a timed, gamified evolution of the classic Schulte table (a fixed 5x5 number grid used in speed-reading and attention training). Instead of one static grid, it chains progressively larger grids together against a single countdown clock, rewarding sustained accuracy over the whole run rather than one isolated attempt.
Is this concentration grid test free to play?
Yes. Concentration Grid on SkillDrills is completely free with no sign-up, downloads, or paywalls. It runs directly in your browser on desktop and mobile.