Variation on four 4's game but with digits of number
Here's one I came up with years ago and have toyed with off and on since then. For every two-digit number, create the number using four of its digits. Rules: You must use exactly...
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Here's one I came up with years ago and have toyed with off and on since then. For every two-digit number, create the number using four of its digits. Rules: You must use exactly...
Fix the matchstick equation in this math puzzle
Take apart the grid in this math puzzle
Desktop Version Recommended. Browser Tab Bars aren’t for puzzles; they are for attributions. $$\begin{array}{|l|l|l|l|}\hline \small\color{white}{\bbox[5pt, gray]{\textsf{My Cal...
Six variables рќђґ, рќђµ, рќђ¶, рќђ·, рќђё, рќђ№ are distinct integers from 1 to 10 (inclusive). They satisfy the following conditions (I've added mathematical definitions on the r...
Inspiration for this puzzle came from this recent puzzle: Find all digits in abc·de - fgh·ij=0 where each digit 0–9 is used exactly once Rational Thinking Required A, B, C, D, E, F...
Your teacher shows you an image (with some text): A fly is placed exactly at the centre of a unit ?????? and its goal is to fly to the red point which lies on the ???????. A mous...
Move exactly 4 matchsticks to make the equation true Move exactly 3 matchsticks to make the equation true Move exactly 4 matchsticks to make the equation true
Here's a twist on another puzzle from Alex Bellos's Can You Solve My Problems?. The original puzzle is this: Arrange the digits 1-9 to satisfy the following equations: _ _ * _ = _...
By determining the result of the computation, the language, and the function ip compute the integer pi. ord((ip(4)*ip(2)*ip(pi)).to_bytes(2,'little').decode())
Find all digits in the equation: $$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...
Six variables рќђґ, рќђµ, рќђ¶, рќђ·, рќђё, рќђ№ are distinct integers from 1 to 10 (inclusive). They satisfy the following conditions (I've added mathematical definitions on the r...
I've been doing a lot of levels of the 'sort the nuts puzzle', available for example here but also in various other places. Here is a picture of what a typical level looks like (th...
Puzzle attribution: Me Goal of Hidato: Fill in the following grid with a series of consecutive numbers that connect to each other horizontally, vertically, or diagonally. Specia...
I was pondering about a "how many ..." question that crossed my mind. I was happy to discover the answer is 42. To help me solve it I sketched the following diagram. Can you figu...
If , what is 3 + 4? The answer is a number.
Each row of question mark/marks is to be replaced by a single symbol (just to clarify, regardless if it's one "?" or six "?" or whatever number of "?", that row will consist of a s...
(While creating this sequence puzzle I checked around the site for similar content and - finding none - believe this should be its first appearance in our regular catalogue...) In...
When my friend and I were in the living room, my friend suddenly told me to enter the kitchen. My friend had arranged a puzzle for me, and wanted to see if I could come up with a m...
A very hard puzzle consisting of a grid and a riddle. The Hive A Puzzle of Silence and Numbers 8 5 2 1 2 5 1 8 8 1 5 2 1 2 5 3 1 11 6 7 1 6...
In this puzzle it is your job to identify what is hidden behind all of this 81 52981144144 168125. 81 5291361 361225 64814964. 4006425 529148425361 12125256400 6481400400811964...
I did an implementation of both sides ("define challenge" - computer guesses and also "find the bullet") "Twelve balls and a scale"-Problem for arbitrary numbers of bullets. https:...
Two computer programs are enjoying the new RAM that the computer's owner just put in their new computer. They decide to play a game with their new memory. Initially, all the bits i...
Replace the question marks with the correct numbers.
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