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Recent items include:

  • Math puzzle: Fix the matchstick equation
  • Please help me fill my number square.
  • Only you use 4 bottons in calculator without use 0 and answer will be 500 [closed]

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scientificamerican.com /1 month ago

Math puzzle: Fix the matchstick equation

Fix the matchstick equation in this math puzzle

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puzzling.stackexchange.com /4 weeks ago

Please help me fill my number square.

I don't like to cross words with people, I would rather cross numbers with them. Have fun! 1A: Baby's first numbers 4A: Kaprekar's favorite 8A: Baking some pie 10A: Abundent and Sp...

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puzzling.stackexchange.com /3 days ago

Only you use 4 bottons in calculator without use 0 and answer will be 500 [closed]

You only use 4 bottons in calculator without use 0 and answer will be 500

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puzzling.stackexchange.com /1 month ago

Rational thinking required

Inspiration for this puzzle came from this recent puzzle: Find all digits in abc·de - fgh·ij=0 where each digit 0–9 is used exactly once Rational Thinking Required A, B, C, D, E, F...

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hardcoregaming101.net /3 weeks ago

Calcolo!

Calcolo refers to itself as “Ochimono Shooting” (“Falling Object Shooting”). The closest point of comparison is ADK’s Twinkle Star Sprites, but while that was a shoot-em-up with so...

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scientificamerican.com /4 weeks ago

Math Puzzle: Go to great lengths

Find the lengths of the sides of the square in this math puzzle

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puzzling.stackexchange.com /1 month ago

Wait, where's my 123456789?

Can you solve my 9 by 9 crossword puzzle? Numbering is standard, and numbers are clued iff they are at least 2 digits long. Across 01. D08 + 2 03. D06 - 2 05. A07 + 2 07. Prefix of...

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puzzling.stackexchange.com /3 weeks ago

Make 1-10 with 1, 2, 3, 4... but the 1s are lying!

It looked like a normal formation-of-numbers question: Use one copy of each digit 1, 2, 3, and 4 in any order to make expressions that evaluate to the integers 1-10. Allowed opera...

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puzzling.stackexchange.com /6 days ago

Logically deduce the values of A–F, where each letter is a different integer from 1–10.

Letters A-F are unique integers from 1-10 inclusive. Can you determine the solution through a logical sequence that uses forced deduction chains, and avoids hypotheticals such as "...

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puzzling.stackexchange.com /3 weeks ago

Crossing sums, all different

This puzzle is part of Monthly Topic Challenge June 2026: Same grid, different execution. Can you place numbers 1 to 12 in this grid in such a way that all vertical and horizontal...

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puzzling.stackexchange.com /1 week ago

A matchstick equation... or is it?

Make a correct statement This puzzle is my own creation, so there may be multiple solutions. I know of one but will consider any answers on their own merits. Here is an incorrect s...

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dailymail.com /1 month ago

Simple-looking math test question leaves people baffled - can you solve it in 30 seconds?

Get out your timer and number two pencil to see if your arithmetic skills from grade school are still intact.

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puzzling.stackexchange.com /1 month ago

Find all digits in abc·de - fgh·ij=0 where each digit 0–9 is used exactly once

Find all digits in the equation: $$abc⋅de-fgh⋅ij = 0$$ where: Each letter represents a distinct digit from 0 to 9. No digit is repeated anywhere in the expression. The leading dig...

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puzzling.stackexchange.com /1 week ago

I have a grid of numbers, but what game was I playing?

I'm all primed to start the game, but I forgot what we were supposed to be playing. Can you folks help me get this sorted out?

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puzzling.stackexchange.com /3 weeks ago

Turning the tables... but how?

Miss Plum's problem Miss Plum (not a real person) works as a primary school teacher's assistant. One day, she was asked to finish putting some posters on the wall. So far, the teac...

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puzzling.stackexchange.com /1 month ago

Around on circles (yes, on, not in).

This puzzle is an original. I have a solution to all parts but there may be better, more elegant, solutions out there and I know from past puzzles that some really, really good lat...

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puzzling.stackexchange.com /3 weeks ago

Shakashaka: Cross products

This puzzle is part of Monthly Topic Challenge June 2026: Same grid, different execution. Mark some cells half-shaded along a diagonal (one half white, one half black), so that ev...

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puzzling.stackexchange.com /1 week ago

Ditloids - riddles with letters and numbers.

A bit of background (this is not part of the puzzle): in 1981 William Shortz published a puzzle in Games Magazine called "Equation Analysis Test". The puzzle style grew in populari...

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puzzling.stackexchange.com /1 month ago

Any help with this?

Here it is, hope someone can solve it.

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puzzling.stackexchange.com /6 days ago

Nice geometry puzzle of squares, triangle and circle.

This is not an original, I saw it today (link given in spoilers - also shows solution, so really is a spoiler...) Squares, triangle and circle puzzle This puzzle was shown to me to...

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puzzling.stackexchange.com /1 month ago

A puzzle for an abstract game

I would like to introduce a puzzle based on an abstract game I am developing / discovering: Cayley Connect is a chess-inspired abstract game where each player has equal numbered pi...

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puzzling.stackexchange.com /3 weeks ago

Akari: Cross-examination

This puzzle is part of Monthly Topic Challenge June 2026: Same grid, different execution. This is an Akari ('Light Up') puzzle with a twist. Rules (adapted from Nikoli): Place l...

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puzzling.stackexchange.com /1 month ago

Cross Grid Tangrams Optimal

I know what you’re thinking. All you wanna do is to fill the Monthly Topic Challenge’s cross grid in with tangram pieces, am I right? Very well, I’ll sell you some tangrams and at...

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puzzling.stackexchange.com /1 month ago

Help me figure out a title for this one.

I really like puzzles like this. I think this particular format may catch on in the future!

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rss.sciam.com

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dailymail.co.uk

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hardcoregaming101.net

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puzzling.stackexchange.com

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