42 open experiments

Experiments.

Each one is based on published research and takes a few rounds; most last two or three minutes. At the end you compare your answer with the crowd and read the science behind the finding. Play again as often as you like.

All Arcade Group Perception Memory and attention Decisions and logic Games Numbers and chance Race mode Not played yet

Most played in the last 30 days first. 5 experiments

EXP. 004 · Time perception

Feel 10 seconds

How precise is your inner clock? Try to hit 10, 3 and 20 seconds without counting, then keep a one-per-second beat, and see whether your error grows with the duration.

2 min8 responses

Plays in the last 30 days: 6

EXP. 010 · Visual illusion

Which line is longer?

Matching two lines looks easy, until arrowheads, rails, and surrounding circles get involved. We measure how much your eyes are fooled in four illusions.

2 min5 responses

Plays in the last 30 days: 3

EXP. 023 · Attention

Spot the change

The scene flickers back and forth; the difference is right in front of you, yet seeing it can sometimes take half a minute. Try change blindness for yourself.

2 min3 responses

Plays in the last 30 days: 3

EXP. 025 · Number sense

How many dots?

We see three dots at a glance, but we estimate thirty. Measure how many you can count at a glance and how far off your estimates are.

2 min1 response

Plays in the last 30 days: 1

EXP. 016 · Spatial thinking

Mirror or not?

The more a letter tilts, the more your mind seems to actually turn it. How fast do you rotate letters, shapes, and images under time pressure?

2 min2 responses

Plays in the last 30 days: 0