Charming interlocking wood sculptures

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

A puzzle expert shows off some of his favorites

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

Coin puzzle: How do you make a circle of 6 coins from two rows in only 3 turns?

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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Watch how to solve a maze hidden inside a metal cylinder

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 crowssword puzzle

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

Can you solve the seven planets riddle?

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


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Cool magic trick: The Perpetual Puzzle

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

Absolutely brutal single color jigsaw puzzles

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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Good deal on a highly rated Rubik's Cube - $5.21

Amazon is selling this cool-looking speed cube for $5.21. I love the colors. I have been trying to solve Rubik's Cube for decades. I'll get it one day!

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Can you solve the dark room coin riddle?

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

Surprising result of calculating speeds of two cars hitting a tree

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

How to solve a masyu logic puzzle

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

Cave puzzles look like fun - here's how to solve them

Puzzle designer Fleb shows how to solve a "cave puzzle," which is a logic puzzle that reminds me a bit of sudoku. It looks fun! Read the rest

Four ninths of a Rubik's Cube

If an entire 3x3 Rubik's Cube is too much, but a 2x2 one too plainly insulting, try this 2x3 one that you can get for about a fiver at Amazon. That's four ninths of a real Rubik's Cube for nine tenths of the price!

The product page assures you in its first bullet point that this puzzle contains "no fabrics." SOLD. Read the rest

Geode jigsaw puzzles

This stunning line of geologically-inspired jigsaw puzzles, named Geode, is the creation of Massachusetts-based generative design studio and retailer Nervous System.

As described in their blog:

Geode is a jigsaw puzzle inspired by the formation of agate, a colorful banded stone. Each puzzle is unique, emerging from a computer simulation that creates natural variations in the shape, pieces, and image. Hundreds of lasercut plywood pieces intertwine to form a challenging, maze-like puzzle. Each geode is a slice of an algorithmic rock.

The puzzles are intricately cut in birch plywood, completely unique from each other, and available in two sizes (approx. 180 pieces for $60 and 370 pieces for $95).

(My Modern Met) Read the rest

Zenth is a 3D wooden labyrinth

Fans of The Perplexus (one of my favorite puzzles) might be interested in Zenth, a 3D wooden labyrinth on Kickstarter. As in The Perplexus, the object is to guide a steel ball through a multiplanar labyrinth. In fact, the creator of Zenth was a student of the creator of The Perplexus, Michael McGinnis (who wrote an article for me about designing The Perplexus when I was editor-in-chief of Make).

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How to fold a fitted sheet

If you've ever tried to fold a fitted sheet, you probably know you can't just fold it like a regular sheet. If you are like me, you will just wad it up and hide your shameful attempt in the closet. Here's a woman made of better stuff than me, who has conquered the fitted sheet conundrum. The first video shows you how to fold a fitted sheet without elastic all around the edges, and the second video shows how to fold one with elastic all around the edges.

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