Perception · Test
Which shape is different — rotated, counted, patterned? 20 rounds, subtler each time.
No account. No tracking. Your results stay with you.
Which one is different?
Rotation, count, sides or stripes — one shape differs. Twenty rounds, subtler each time.
Needs to compare shapes visually. Select with click, tap or arrow keys and Enter.
One shape in the grid differs from the others — by rotation, by the number of dots, by the number of sides, or by the angle of its stripes. Every shape shares a random base rotation, so orientation alone is never the clue. Select the odd one.
Twenty rounds. Each block of four rounds uses each kind of difference once, in random order. Differences get subtler as you go (for example, rotation from 60° down to 12°), and the grid grows from 3×3 to 4×4 after round 10.
score = correct answers out of 20 time = median time per correct answer
A wrong answer moves on to the next round (and shows which shape it was). There is no time limit, but your time is recorded.
The test runs entirely in this browser tab. Results are saved only in this browser's local storage so you can compare with yourself — never uploaded, never tracked. You can clear them any time.