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Can't Unsee

Two near-identical interfaces, one of them subtly wrong. Getting past the third level takes an unreasonable amount of care.

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How to get the most from it

Can't Unsee sits in Design Challenges under Make, filed as coffee break.

  • Set aside five to fifteen minutes and give it your proper attention.
  • Use a laptop or desktop computer — we file it as desktop only.
  • It works with the sound off, so it is fine on a train or in a quiet office.
  • No account needed — you can start without signing up.
  • Go in expecting something brainy, competitive and clever.

About this category: Kerning trials, alignment tests, colour matching and spot-the-difference for interface designers. Humbling in a useful way.

Good for

  • Filling a coffee break properly
  • Giving your brain a workout
  • Chasing a better score
  • Being impressed by a clever idea
  • A quiet break at your desk
  • Trying it with zero commitment

Can't Unsee: quick answers

Is Can't Unsee free?

Yes. Can't Unsee is free to use and needs no account.

Do I need an account to use Can't Unsee?

No. You can use Can't Unsee without signing up for anything.

Does Can't Unsee work on a phone?

Not well. We file Can't Unsee as desktop only, so open it on a laptop or desktop computer.

Is Can't Unsee safe for work?

Yes, we file it as safe for work. It also works muted.

How long does Can't Unsee take?

We file it as "Coffee break": Five to fifteen minutes of proper attention.

More in Design Challenges

All 14 in Design Challenges
  • Match hue, saturation and complementary colours against a target, one exercise at a time, scored out of a hundred.

  • Recreate a target image in as few characters of CSS as possible, then watch somebody do it in half as many.

  • A hundred consecutive interface prompts delivered by email — the sign-up flow, the 404 page, the calculator, day by day.

  • Shoot the alien whose colour matches the hex code shown. Learning to read hex by sight is an accidental side effect.

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