All brain and sensory challenges
Ten free browser challenges for reasoning, memory, reaction, attention, colour, fine detail and hearing. Each one has an Entry, Regular and Hard level, and every level gives a free raw score straight away, with no sign-up.
Compare the challenges
| Challenge | Category | Time | Levels | Device and input | Free result (Entry) |
|---|---|---|---|---|---|
 IQ Style Reasoning Puzzles | Reasoning and memory | About 10 minutes | Entry, Regular, Hard | Any screen at least 320 px wide. Mouse, touch or keyboard. | Correct answers out of 12, answered count and completion |
 Reaction Time Test | Speed and attention | About 2 minutes | Entry, Regular, Hard | Keyboard (Space) or one touch target. Input lag differs between devices. | Median response time in milliseconds |
 Sequence Memory Test | Reasoning and memory | About 3 minutes | Entry, Regular, Hard | Mouse, touch, or the number keys 1 to 9. | Correct sequences out of 8 |
 Sustained Attention Challenge | Speed and attention | About 1 minute | Entry, Regular, Hard | Keyboard (Space) or one touch target. | Balanced accuracy and median correct response time |
 Spatial Reasoning and Rotation Test | Reasoning and memory | About 4 minutes | Entry, Regular, Hard | Mouse, touch or keyboard. | Correct answers out of 6 |
 Spot the Difference Challenge | Speed and attention | Up to 3 minutes | Entry, Regular, Hard | Larger screens make this easier. Mouse or touch. | Changes found out of 6 and elapsed time |
 Color Discrimination ChallengeInformal, not a health screening | Seeing and hearing | About 2 minutes | Entry, Regular, Hard | Use your usual vision correction, normal lighting and a comfortable viewing distance. | Shapes matched out of 6 |
 Hearing Perception ChallengeInformal, not a health screening | Seeing and hearing | About 2 minutes | Entry, Regular, Hard | Headphones in a quiet room. Sound starts silent and only plays when you press a button. | Correct intervals out of 6 |
 Visual Gap Direction ChallengeInformal, not a health screening | Seeing and hearing | About 2 minutes | Entry, Regular, Hard | Keep your usual glasses or contacts on and sit at a comfortable, normal viewing distance. Do not zoom the page during the activity. | Correct answers by gap size |
 Multitasking and Dual Task Challenge | Speed and attention | 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 |
Browse by category
Reasoning and memory challenges
These challenges ask you to work something out or hold it in mind: a hidden rule in a grid of shapes, a shape turned in your head, or a sequence of lit cells.
3 challengesSpeed 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.
4 challengesSeeing and hearing challenges
These challenges use colour, fine detail and quiet sounds. They are games that show how you do on your own screen and headphones.
3 challengesBefore you compare results
- Scores are only comparable within the same test and level. Entry, Regular and Hard each keep their own score.
- Timed results depend on your screen and input. Compare attempts on the same device.
- Colour, vision and hearing challenges are games, not eye or hearing tests. Read the disclaimer.
- How every score is calculated is on the methodology page.