3 ms·

That's barely even a puzzle. It's more of an optical illusion

• RiderOfGiraffes 17y ago
  Lots of people take a long time to get this one. It's what I call an STF problem - Slap the Forehead." Unless you see it instantly, when you do see it you are so frustrated ...
  • alex_c 17y ago
    Argh. Yes, that's exactly how I felt when I finally got it. :p
    • danek 17y ago
      me too. wow, it's sooooo simple. the trick is to not think.
• JBiserkov 17y ago
  it's more of "high school training in math has failed you" (right triangle <=> Pythagoras) -> bad