Speed and attention challenges

These challenges are about responding quickly and accurately: reacting to a cue, holding back for the wrong symbol, juggling two tasks or scanning a scene for changes.

Your browser measures the timing, so your screen and input device are part of every result. Use the same device and input when you compare attempts.

Which one to try

• Reaction Time TestA free reaction time test.
• Sustained Attention ChallengeA free go/no-go attention challenge.
• Spot the Difference ChallengeA free spot the difference challenge with original scenes.
• Multitasking and Dual Task ChallengeA free dual task challenge.

At a glance

Challenge	Time	Levels	Device and input	Free result (Entry)
Reaction Time Test	About 2 minutes	Entry, Regular, Hard	Keyboard (Space) or one touch target. Input lag differs between devices.	Median response time in milliseconds
Sustained Attention Challenge	About 1 minute	Entry, Regular, Hard	Keyboard (Space) or one touch target.	Balanced accuracy and median correct response time
Spot the Difference Challenge	Up to 3 minutes	Entry, Regular, Hard	Larger screens make this easier. Mouse or touch.	Changes found out of 6 and elapsed time
Multitasking and Dual Task Challenge	About 2 minutes	Entry, Regular, Hard	Keyboard (Space) or one touch target, plus taps or arrow keys to choose a slot.	Accuracy for both tasks

Comparing results

Timed scores from a phone and a keyboard are not comparable, and choice reaction (Hard) is a different measure from simple reaction. How every score works.

Other categories: Reasoning and memory challenges · Seeing and hearing challenges · All challenges