Brain Teasers
Hardest Optical-Illusion Teasers
An optical illusion is a visually perceived image that is deceptive or misleading. You can browse the optical illusions via this list or via a graphical list.
These brain teasers have been voted as the most difficult. Only teasers with at least 20 votes are shown. Good luck solving them!
Optical Illusions
| Title | Popularity | Difficulty | |
|---|---|---|---|
| 16 | Grey Dots |  |
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| 17 | Native American or Inuit | |
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| 18 | Right Angles | |
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| 19 | Circle Square? | |
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| 20 | Glasses and Dumbbells | |
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| 21 | US Flag | |
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| 22 | Frazer's Spiral | |
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| 23 | Unstable Fins | |
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| 24 | Chair or Block | |
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| 25 | Blivet | |
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| 26 | Equal Circles | |
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| 27 | Scintillating Grid Illusion | |
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| 28 | Rotation | |
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| 29 | Face or Vase | |
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| 30 | Cafewall | |
| Previous | 1 2 |
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