Reaction Test, the fastest break in the lineup

Reaction Test is the odd one out here, and the shortest thing in the lineup. There is no grid and no deduction, just a red screen, the flick to green, and an honest number that arrives about a second later.

Five attempts give you a median and a best, plus a percentile showing where you land among everyone else who has tried. Aim, choice, audio, memory and clicks-per-second tests are there when one number stops being enough.