Test your reaction speed. Train your brain.

Measure how quickly you respond after a visual signal changes. Practice five randomized trials and compare your median, no

Test your words per minute, raw typing accuracy and corrected character counts on randomized passages.

Measure the number of pointer clicks registered during a timed five-second clicking challenge.

Click twenty randomly positioned circular targets to practice precise cursor movement and target acquisition.

Remember and replay progressively longer sequences of colored pads in a Simon-style memory game.

Solve fresh arithmetic questions under a timer and improve mental calculation speed and precision.

Practice attention and impulse control by tapping only green GO signals and ignoring red STOP signals.

Practice accurate digit entry on generated number sequences and measure speed without recycling the normal prose typing te

Recall randomly generated numbers that grow in length as you succeed at each memory level.

Infer a missing term from generated arithmetic or geometric-like numeric patterns.

Pick the subtly different shade from a grid of colored blocks, with increasing difficulty.

Tap a steady rhythm and calculate its beats per minute using the average time between recent taps.

Match a randomly presented arrow direction as quickly and accurately as possible.

Measure the delay between a green signal and releasing a held input.

Practice waiting through unpredictable signal delays without guessing early.

Combine matching number tiles on a four-by-four grid.

Solve a scrambled three-by-three number slider.

Unscramble ten shuffled common words.