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Questions tagged [logical-deduction]

A puzzle that requires formal logical deduction to arrive at the solution. This suggests more than merely reasoning through clues to find an answer (you might want [situation] for that).

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Is there a move-efficient way to rotate the center pieces on the Octo-Star?

I'm looking for a more efficient algorithm to rotate the center column of the Octo-Star puzzle 45 degrees. The situation below occurs when four properly-oriented edges are next to each other, ...
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9 votes
1 answer
2k views

Is there another name for this puzzle? (Kyudoku, Nine Find)

Is there another name for this type of puzzle? I can only find two examples of it online: https://www.brainzilla.com/logic/kyudoku/ http://ninefind.com/ In the game you start with a 6x6 grid filled ...
Rory's user avatar
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7 votes
0 answers
165 views

Logic and geometry problem 2

My question is whether or not a deadlock can occur in Crisscross. A deadlock is defined as a position, an arrangement of checkers, in which the board has been filled but neither player has won. ...
Mark Steere's user avatar
6 votes
0 answers
288 views

Trying to find a 2020 puzzle hunt with a puzzle based on Among Us

I am trying to find a puzzle hunt that I believe was held in 2020. It contained a puzzle based on the game Among Us with 26 characters, and you had to decide who were the imposters. The imposters all ...
Cat's user avatar
  • 61
6 votes
0 answers
188 views

Decoding a mystery sequence of falling boulders

I'm trying to unravel the algorithm for an old 1980s game called Wanderer. The game is a simple grid: 16 cells high (all visible in the image) and 40 cells wide (though not all are depicted). In the ...
geotheory's user avatar
  • 161
5 votes
1 answer
460 views

Oh no, my chocolate banana puzzles are not unique!

There is a hidden message (7, 2) inside the solutions of the nine puzzles. An answer will only be accepted if it correctly identifies said message. Here are the Chocolate Banana puzzle rules. Each ...
Sny's user avatar
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5 votes
0 answers
263 views

The Jumbled Jaunts of Jormungandr

Jormungandr, the Snakebot of Doom has left New York. The world's armies and air forces have been decimated and cannot stop it. It has moved on from New York, and has flattened the following North ...
Monty Wild's user avatar
3 votes
0 answers
214 views

Filling in an 8x8 minesweeper grid with mines (Day 2: Diagonal Reverse Synesthesia)

Note: This is based off of Day 30 of the Minesweeper Advent Calendar on heptaveegesimal.com So my first minesweeper puzzle did not go so well. I will try to do better today. First off: This is a torus ...
CrSb0001's user avatar
  • 2,413
3 votes
0 answers
285 views

Find a missing number in this 28x21 grid

355|066|677|855|677|081|044|855|355|062|216|677|216|855|224|044|034|046|051|677|355|264|044|046|044|351|886|043 043|044|886|357|886|352|225|357|043|222|993|001|233|968|046|225|062|041|351|886|043|227|...
alternative's user avatar
3 votes
0 answers
452 views

Logical descriptions of logic puzzles

What notations are there to describe a logic puzzle format? Here, I'm talking about logic puzzles like Sudoku, Bridges, Kakuro, Tents; games with exact rules and an exact & finite number of ...
Larry B.'s user avatar
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2 votes
0 answers
277 views

5 guards, and get rid of the timer!

I like the lies and statistics question, but it is a bit too violent, so I suggest a (slightly harder) and way less violent version. You are looking at the basement of your house, and you see three ...
3-1-4-One-Five's user avatar
2 votes
0 answers
179 views

Making a large Candy Crush unicolor box

I played the arcade game Klaxxon a lot (comparable mechanics to Candy Crush, long before the latter even existed) and always wondered if I could get a monster super ultra bonus by making a 3 x 3 ...
Hauke Reddmann's user avatar
2 votes
0 answers
189 views

What is the Name of this Toggling Puzzle?

I came across an interesting toggling puzzle while looking through a code repository on GitHub. I want to find out more about it and see if there is any info on how to solve it, how to ensure ...
Robin Andrews's user avatar
1 vote
0 answers
183 views

Deadlock possible in Minefield?

A deadlock is a position in which neither player has won and neither player has a legal placement available. My question is, "Can you find a deadlock position in Minefield?" And, if you ...
Mark Steere's user avatar
1 vote
0 answers
215 views

Multi smol boi puzzle I: apologies

Disclaimer: Jryy, svefg bs nyy, V jbhyq yvxr gb ncbybtvmr. Abg sbe npgvbaf (jryy bxnl, sbe npgvbaf), ohg sbe zl fzby obv pvcure. Vg frrzf gung zl svefg fzby obv chmmyr jnf whfg n ovg gbb uneq. Fb, gb ...
CrSb0001's user avatar
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1 vote
0 answers
193 views

Puzzle Challenge: Unraveling the the Circular Conundrum

Known are five numbers: 1, 2, 3, 4, and 5, arranged clockwise. The number after 1 is 2, after 2 is 3, after 3 is 4, after 4 is 5, and after 5 is 1. Whenever two adjacent numbers meet, it triggers a ...
Kevin's user avatar
  • 11
1 vote
0 answers
137 views

Circuissonne Diagrams

This puzzle is part of the Monthly Topic Challenge #7: Board games. And also, this puzzle is also a parody of XKCD's 730. We're starting a project on Explain XKCD (link currently not available) to ...
Scratch---Cat's user avatar
0 votes
0 answers
202 views

Continue with sudoku - how do I scan for next steps?

I filled some cells, but am stuck here. I cannot go any further. How do I advance? How would I scan the Sudoku to recognize next steps? I've taken the puzzle from https://play.google.com/store/apps/...
Abbas Baghirov's user avatar
0 votes
0 answers
85 views

Heuristic function for estimating nurikabe puzzle state

I am trying to write a program for solving nurikabe puzzle. I need a method to approximately represent the state of the game in one number, to choose the best way for the algorithm to continue. I can'...
Papouc's user avatar
  • 1
0 votes
1 answer
329 views

Sudoku variants #1: Schrödinger's Grave (6x6 grid)

Not in conjunction with my Minesweeper puzzles - that would be concerning! Inspired by Cracking The Cryptic's video "The Graveyard Of Schrödinger" (original gimmick by fjam) How this ...
CrSb0001's user avatar
  • 2,413
0 votes
0 answers
84 views

Filling in an 8x8 minesweeper grid with mines (Day 7: Double Mines)

Note: This uses anti, single, double, and triple mines Yes, I realize that when I uploaded Day 6, I mentioned in the disclaimer that I planned for this to be released tomorrow, along with Day 8, ...
CrSb0001's user avatar
  • 2,413
0 votes
0 answers
219 views

Logic puzzles: Flags and Stripes

Puzzle 1 Puzzle 2 Clues The only instructions given to solve this is that the answer can be alpha-numeric text. Ideas Puzzle 1: 3 flagpoles seem to have top-balls (called a truck), while 3 don't ...
nomad.lw's user avatar
  • 139
0 votes
1 answer
495 views

Understanding solution for this puzzle where truth-tellers and liars describe game scores

Source (Page 26-28) Frieda was fond of visiting exotic locations. On her visit to the island of Yippiekaiyay, she was surprised that the natives of the island could be classified into one of two ...
Fin27's user avatar
  • 111
0 votes
0 answers
186 views

A mysterious letter in the mail

The other day I got a letter in the mail.... It was a weird one, one that obviously boasts a puzzle. The Letter It states the following I like pigs, don't you? Won't you come and see the piggies with ...
ThatBirdThatLearnedToCode's user avatar
0 votes
0 answers
269 views

Reverse Engineering Computer Formula

A computer uses an unknown formula to create a 4 digit Output using specific Input. Here are 3 examples: Input = 20066 : 020470 : 47 : 1 : 322267 Output = 0927 Input = 20066 : 020470 : 46 : 3 : 198684 ...
wonderfulsomebody's user avatar
-1 votes
2 answers
467 views

Italian Exhibition - A Zebra Puzzle (Einstein's Riddle) Variation

You can play this Zebra Puzzle here: https://www.brainzilla.com/logic/zebra/italian-exhibition/ Woman #1 Woman #2 Woman #3 Woman #4 Woman #5 shirt name surname painter time age Five women are ...
hampter's user avatar
-2 votes
1 answer
167 views

What are the largest and smallest numbers in decimal base in this special Sudoku?

I have constructed the following hexadecimal 16×16 sudoku in this site: The rules are like 9×9 sudoku tables (each number and letter should repeat only one time in each column, row, and 4×4 ...
Etack Sxchange's user avatar