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Sign up for our newsletter and never miss an animation: http://bit.ly/TEDEdNewsletter One hundred green-eyed logicians have ...

Can you solve for the day of the week Abby was born? What about Barry? This is an incredible logic riddle. van Ditmarsch, Hans, ...

... Raymond Smullyan, and popularized by his colleague George Boolos, this riddle has been called the hardest logic puzzle ever.

Four friends claim they have been wrongly imprisoned. They are not criminals but mere harmless logicians! The warden says, "If ...

An evil logician takes Alice and Bob captive. They have a chance to escape if they can deduce the total number of trees in the ...

You're a bank robber trying to escape from jail. Can you solve the riddle to get past the fence to freedom? -- Your timing made you ...

An evil warden holds you prisoner, but offers you a chance to escape. There are 3 doors A, B, and C. Two of the doors lead to ...

Can you ace these challenging puzzles? Skills tested: outside the box thinking, creativity, logic, pattern recognition, Harvard ...

Practice more problem-solving at https://brilliant.org/TedEd -- Your friend's birthday is tomorrow, and he's turning… well… you've ...

TED-Ed has launched its first ever physical game: Pandora's Legacy! Learn more and get your copy here: ...

View full lesson: https://ed.ted.com/lessons/can-you-solve-the-bridge-riddle-alex-gendler Want more? Try the buried treasure ...

Flame of Darkness - To lift the curse this brave adventurer must extinguish the Flame of Darkness! But first he must get past the ...

Can you use some logic to figure out what color your hat is in this quick puzzle? Difficulty: 3/10 Chapters: 0:00 Intro 1:56 Pause ...

What is the code lock pin? Can you crack the code for the 3x3 grid? 0:00 puzzle 1 4:37 puzzle 2 Code lock pin puzzle ...

Can you solve this? Special thanks this month to: Lee Redden, Kyle, Daniel Lewis. Thanks to all supporters on Patreon and ...

These are puzzles that look hard but are actually easy! Get the puzzles in this video for only $0.01... yes, you read that right ...

Match stick puzzle | Puzzles with Answer | Feed Brain with Prema #MatchStickPuzzle #Puzzles #CriticalThinking ...

This is a famous problem that has been used in technical interviews, and it has even appeared on a Mathematical Olympiad.