Questions tagged [grid-deduction]
Puzzles such as Sudoku or Kakuro, where the final state of a pre-existing grid must be deduced logically through clues placed within and/or around the grid. Use with the [logical-deduction] tag. For puzzles where you are given a list of clues which can be used to compose a grid to solve them logically, use the [logic-grid] tag instead.
1,090
questions
7
votes
1
answer
58
views
Are you radical enough to solve this SURDOKU?
All "surds" represent whole numbers smaller than 15, and the same number is never used twice with the same index. (It's a sudoku.)
Attribution: PUZZLEBOMB.co.uk. Puzzles by @stecks & @...
- 12.8k
10
votes
3
answers
527
views
Fill the grid subject to product, sum and knight move constraints
Using the numbers 2, 3, 4, ... 19 each exactly once, fill some of the empty squares in the grid with a number so that the product of the numbers in each row is as shown, as is the sum of the numbers ...
- 12.8k
7
votes
1
answer
125
views
A colourful Colombian Sudoku
Fill the sudoku on the left so that each column, row, 3x3 box, and cells of the same color contain the numbers 1 to 9. The dots show how many numbers in the row or column of the grid on the right ...
- 551
15
votes
1
answer
644
views
Tombs of Ancients
This is part 68 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Dear Puzzling,
The top grid here is a Yin-yang puzzle. Shade some cells in the grid so that ...
- 78.6k
6
votes
1
answer
560
views
What should the next step be in this Kakuro puzzle?
I have recently been learning more and more tricks for solving Kakuro puzzles, but I'm at a loss for how to solve the final bit of this puzzle. For reference, it is from the "Real Kakuro" ...
- 163
8
votes
1
answer
609
views
Bulls and Cows meet Sudoku!
This is a Colombian Jigsaw Sudoku where the usual rules apply, but with irregular boxes. The dots in the right-hand scheme indicate how many of the numbers in a particular row or column are correctly ...
- 551
17
votes
2
answers
1k
views
Going around in circles
Solve the grid. Then solve the grid again.
The answer can be one or two letters long.
- 4,147
18
votes
2
answers
1k
views
Nonconsecutive Anti-Knight Fillomino?
Rules of Fillomino:
Fill in all empty cells with numbers under the following rules.
Divide all of the board into blocks.
Fill each block with the same number horizontally or vertically.
Each block ...
- 16.2k
18
votes
1
answer
1k
views
66: Luftballons
This is part 66 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Dear Puzzling,
This is a Dosun-Fuwari puzzle. Place some balloons (white circles) and anvils (...
- 78.6k
16
votes
1
answer
2k
views
What's the one digit you can fill in this partially hidden Sudoku?
A few weeks ago, I challenged some people to solve the puzzle I made. Two of them took it more or less seriously, but couldn't find the right solution. Now they are excited to see whether or not ...
- 270
2
votes
1
answer
195
views
A Framework puzzle
About Framework puzzles:
A Framework puzzle is similar to a Fill-in puzzle, except there is no rigid crossword-style grid, the tradeoff here being that you get fewer hints for placing (in this case) ...
- 2,423
20
votes
2
answers
732
views
Torus Flow Free
Rules: this is a flow free warp puzzle with a 9x9 grid. connect the respective letters together with lines that travel orthogonally through the centers of grid cells.
additionally, the sides of the ...
- 405
4
votes
1
answer
424
views
Are circles required on the edge of the grid? Part 2
This question is a follow up to a previous question:
Are circles required on the edge of the grid?
The image below is a puzzle from the FlowFree app.
Notice there are no colored circles on the edge of ...
- 12.8k
10
votes
1
answer
331
views
3-clue 5x5 Hidato
Rules
Fill the grid with numbers 1-25 such that consecutive numbers are adjacent orthogonally or diagonally
Try solving it in Penpa
There are only about a dozen 5x5 Hidatos with only 3 clues.
(...
- 1,698
12
votes
1
answer
661
views
Bare Bones – a semi-DIY crossword
This is part 64 of the puzzle series Around the World in Many Days. Each part is solvable on its own.
Dear Puzzling,
This is a semi-DIY crossword. Shade some cells in the grid so that the grid has ...
- 78.6k