VISUAL REFLECTION · 20 ROUNDS
Decide whether the right pixel figure is the exact horizontal mirror image of the left.
Complete 20 timed rounds: 10 Mirror and 10 Not Mirror. Mistakes and timeouts still advance.
READY?
Imagine a vertical mirror between the figures. Every block must reflect horizontally.
Keyboard: M = Mirror · N = Not Mirror · Touch or mouse: use the two labeled buttons
HOW TO PLAY
Compare the asymmetric reference on the left with the figure on the right.
Picture the left figure flipped horizontally—not rotated or moved block by block.
Choose Mirror only when every reflected block matches. A single changed block means Not Mirror.
VISUAL DISCRIMINATION
You must scan an irregular pixel structure, reverse its left-right orientation mentally, and make a two-choice response before the timer expires.
Every reference is intentionally asymmetric. Not Mirror pairs contain a real structural change, so no trial depends on an ambiguous or visually symmetric figure.
READ YOUR RESULT
Standard mode balances 10 Mirror and 10 Not Mirror answers. Accuracy includes wrong answers and timeouts; speed averages use correct answers only.
This is a recreational browser challenge, not a clinical assessment. Compare runs using the same screen and input method.
QUESTIONS
The right figure must match the horizontal flip of the left figure exactly, as if a vertical mirror stood between the two boards.
Every non-mirror pair uses a predefined figure with a clearly moved block. It cannot be the exact horizontal reflection of its reference.
The first answer has 3 seconds. Each correct answer shortens the next deadline toward 0.7 seconds. One mistake or timeout ends the run.
Yes. Tap the two large buttons on mobile, click them with a mouse, or press M and N on a keyboard.