Topic: puzzle

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The Graceful Tree Problem

Draw some circles, the vertices, connected by lines, the edges. Make sure there are no loops in the structure. These are your "trees" or "insectoids" for the puzzle. Next: Fill the circles in with consecutive odd numb...

The Multiplying Rabbits Riddle

After years of experiments, you’ve finally created the pets of the future – nano-rabbits! They’re tiny, they’re fuzzy ... and they multiply faster than the eye can see. But a rival lab has sabotaged you, threatening t...

Can you solve the troll’s paradox riddle?

You and your brother have discovered another realm and set off exploring the new wonderful world. Along the way, you see a troll catching creatures in an enormous net. The troll agrees to release the creatures if you ...

How does a cruciverbalist create crossword puzzles?

How are crossword puzzles made? In this episode of WIRED Masterminds, cruciverbalist David Kwong demonstrates how he makes crossword puzzles for The New York Times. And since he's also a magician, his theme for the cr...

Can you solve the time travel riddle?

Your professor has accidentally stepped through a time portal in his physics lab. You’ve got just a minute to jump through before it closes and leaves him stranded in history. Your only way back is to grab enough colo...

Can you solve the stolen rubies riddle?

Townspeople are demanding that a corrupt merchant’s collection of 30 rubies be confiscated to reimburse the victims of his schemes. The king announces that the fine will be determined through a game of wits between th...

A raccoon demonstrates her problem solving skills

Rascal is a tame raccoon who uses her smarts and sensitive paws to open windows, unlock locks, and get to the tasty treat that awaits her. Can she make it through each obstacle? This impressive clip is from the BBC's ...

Can you solve the alien probe riddle?

Your team has developed a probe to study an alien monolith. It needs protective coatings — in red, purple and green — to cope with the environments it passes through. Can you figure out how to apply the colors so the ...

The Self-Solving Rubik’s Cube

What if, when you twist and turn the Rubik's Cube to mix it up, the cube remembers exactly what you did and/or somehow solves itself? This self-solving Rubik’s Cube does just that, flipping and twisting all over (and ...

Can you solve the Leonardo da Vinci riddle?

You’ve found Leonardo da Vinci’s secret vault, secured by a series of combination locks. Fortunately, your treasure map has three codes: 1210, 3211000, and… hmm. The last one appears to be missing. Can you figure out ...

Can you solve the rogue AI riddle?

You're on a special mission to save the world from a hostile artificial intelligence called NIM. It's taken over computers all over the globe and you only have one opportunity to shut it down. NIM will also be working...

Can you solve the Mondrian squares riddle?

Dutch artist Piet Mondrian’s abstract, rectangular paintings inspired mathematicians to create a two-fold challenge. Can you solve the puzzle and get to the lowest score possible? Board game and puzzle designer and...

Can you solve the penniless pilgrim riddle?

After months of travel, you’ve arrived at Duonia, home to the famous temple that’s the destination of your pilgrimage. The walk from the welcome center to the temple isn't a long one ... but there’s a problem. Can you...

Can you solve the wizard standoff riddle?

You’ve been chosen as a champion to represent your wizarding house in a deadly duel against two rival magic schools. Your opponents are a powerful sorcerer who wields a wand that can turn people into fish, and a power...

Solving a Rubik’s Cube in 0.38 seconds

In November of 2016, the world record for a robot solving a Rubik's Cube was .637 seconds, but as of March 2018, that record appears to have been broken. The ridiculously speedy robot above, built by Ben Katz and Jare...

Can you solve the seven planets riddle?

Your interstellar police squad has tracked a group of criminals to a cluster of seven planets. Now you must apprehend them before their reinforcements arrive. Of course, the fugitives won’t just stay put – they’ll try...

Can you solve the dark coin riddle?

You heard the travelers’ tales, you followed the maps, and now, you’ve finally located the dungeon containing a stash of ancient coins. The good news: the wizard who owns the castle has generously agreed to let you ha...

Universal Calendar Puzzle: Figure out the day of the week for any date ever

Learn how to calculate the day of the week for any date you can think of with this impressive mental trick and some practice. In this It's Okay to Be Smart video, Universal Calendar Puzzle, Joe Hanson demonstrates the...

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