It looks like any other Rubik's cube, but for the little mechanical squeaks it makes as he scrambles it. He puts it down on the table and watches it in silence for a while. Then it moves.

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You thought those single color jigsaw puzzles were difficult? Try putting together one where the pieces change colors! That's just what the latest offering from artist Clemens Habicht does:

1000 CHANGING COLOURS is a colour gamut jigsaw puzzle of 1000 pieces in which each individual tile has two distinct colour states from intersecting gradients of colour. Printed in Poland using a lenticular lens, the colours change depending on the angle of view, resulting in a radiant iridescence that shimmers in beautiful colour combinations.

Pre-order it now for $100 plus shipping.

(The Awesomer, Mike Shouts) Read the rest

NUTCASE is a deceptively simple cast metal puzzle by legendary puzzlemaker Hanayama. If you're not planning to try it yourself, here's how to solve it. Read the rest

Ugears makes gorgeous wooden puzzle toys made from laser-cut plywood that snap-fits to create beautiful, retro machines and sculptures with meshing, working geared mechanisms. Read the rest

Russian speed-cuber Evgeny Bondarenko decided to tackle the biggest challenge on the market today: solving the 17x17x17 Rubik's Cube. Talk about concentration! Read the rest

Math 4 Love founder Dan Finkel writes:

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 powerful enchantress who wields a wand that turns people into statues. Can you choose a wand and devise a strategy that ensures you will win the duel?

(TEDEd) Read the rest

Zenji Funabashi creates colorful animals scultures that lock together in all sorts of fun ways. Imagine the satisfaction of sliding the pieces together. Read the rest

Tim at Grand Illusions chose several of his favorite "photogenic" puzzles to share. Some of them he has not solved yet, and even some that he's solved are still quite challenging to replicate. Read the rest

Here's a fun puzzle explained to us by math writer Alex Bellos (but invented by mathematician Henry Ernest Dudeney) that you can try with six coins. First line them up like this:

Now see if you can arrange them in a circle with only three moves. The two rules: you can slide them but not pick them up, and you must move them to a position where they are touching two other coins.

Here is a video explaining the rules a bit more, but spoiler alert: don't go past 2:37 unless you want to see how it's done.

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YouTuber Mr. Puzzle demonstrates Revomaze, a maze puzzle hidden inside a metal cylinder. Read the rest

Weird Al Yankovic co-authored today's New York Times crossword puzzle. His collaborator was crossword constructor Eric Berlin who writes in the puzzle notes:

We batted around a few theme ideas, some of which seemed worth developing but none of which made it to the finish line. I suggested “The ____ Film Festival,” with that blank to be filled in with whatever struck Al’s fancy. He replied with a long list of cheese/movie puns, and I had no doubt that we had a winner. My very first attempt at the grid included one of my favorites from his list, QUESOBLANCA. I was under the misapprehension that queso is not just the Spanish word for cheese but also a specific kind of cheese. Whoops, not quite. (This was entirely on me, I should note — Al, not knowing during his brainstorming that the end result would be restricted to specific cheeses, had several cheese-adjacent puns in his list, including FONDUE THE RIGHT THING and CHEESY RIDER.)

Download a PDF of the puzzle here. Read the rest

Created by esteemed riddler Edwin F. Meyer, co-author of The Gedanken Institute Book of Puzzles.

(TED-Ed)

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Tenyo is a Japanese magic trick company that's been around since 1960. They are well known for making clever props. (My friend Richard Kaufman, who often writes for Boing Boing, wrote a 1,400-page two-volume set about the company, called Tenyoism)

Here's a Tenyo puzzle trick called The Perpetual Puzzle (It's available on Amazon). You start by showing a rectangle made from 5 pieces. The rectangle fits snugly in a black plastic frame. Next, you show a sixth piece and combine it to the other five to make a larger rectangle. This rectangle also fits perfectly inside the frame. Finally, you show an even larger seventh piece, add it to the other six to form a rectangle. It, too, fits into the frame. How is it done? (If you know, please don't reveal the secret in the comments.) Read the rest

These Japanese single color jigsaw puzzles are appropriately named "Pure Hell." They're available with 1,000 or 2,000 tiny pieces, black or white.

Pure Hell jigsaw puzzles (Amazon via Laughing Squid)

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Watch the video to make sure my summary here is right: You are in a dark room with a pile of coins. The coins have a silver side and a gold side. You know two things about the coins. There are hundreds coins. 20 of the coins are silver side up and the rest are gold side up. It's your job to make two piles of coins that have the same number of silver side up coins. The room is in total darkness and each coin feels the same on both coins.

This video says there in "a surprisingly easy solution." I haven't solved it yet but I have a pile of nickels and I'm going to give it a try.

[via Twisted Sifter] Read the rest

Here's the set up: two cars are side by side on the road. One car is going 70mph and the other is going 100mph. The drivers of the cars see a fallen tree in the road and start braking at the same time. The car that had been going 70mph stops right before touching the tree. How fast is the other car going when it hits the tree? The answer surprised me. Read the rest

Puzzle designer Fleb explains the rules for solving masyu logic puzzles, then solves one, explaining his logic. Read the rest