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Topic: logic
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 ...
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...
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 ...
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...
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...
What does the word ‘theory’ mean in science?
There’s an important difference between a scientific theory and the fanciful theories of an imaginative raconteur, and this quirk of semantics can lead to an all-too-common misconception. In general conversation, a ‘t...
How to spot a misleading graph
When they’re used well, graphs can help us intuitively grasp complex data. But as visual software has enabled more usage of graphs throughout all media, it has also made them easier to use in a careless or dishonest w...
Can you solve the fish riddle?
As the cargo director on the maiden voyage of the S.S. Buoyant, you’ve agreed to transport several tanks containing the last specimens of an endangered fish species to their new aquarium. Unfortunately, the boat is ba...
Turing Tumble, a DIY mechanical computer powered by marbles
The Turing Tumble, this small Pachinko-like puzzle game prototype, is also DIY mechanical computer. Programmer Paul Boswell designed the Turing complete toy to help kids (and adults) learn, see, and feel how computers...
Can you solve the virus riddle?
Your research team has found a prehistoric virus preserved in the permafrost and isolated it for study. After a late night working, you’re just closing up the lab when a sudden earthquake hits and breaks all the sampl...
Can you solve the hardest logic puzzle ever created?
You've crash landed on an alien planet. The only way to get home is to give the correct artifacts to the planet's three alien overlords: Tee, Eff, and Arr. The challenge: Which alien overlord is which? You can fin...
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