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Results tagged with grid-deduction
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user 80061
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.
15
votes
4
answers
937
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 i …
- 5,162
6
votes
1
answer
723
views
Fill the 4x4 grid with numbers to make eight arithmetic progressions
In the 4x4 grid below, fill each empty square with a number such that the numbers in each row form an arithmetic progression when read from left to right. Similarly, the numbers in each column form an …
- 3,527
17
votes
2
answers
758
views
Can you find a grand tour of the rooms in this 12x12 grid?
Puzzle maven Nob Yoshigahara offered this puzzle in the September-October 2000 issue of MIT Technology Review, attributing it to a Professor Kotani. In the 4x4 complex of rooms above, two of the room …
- 8,480
3
votes
1
answer
224
views
Determine what numbers must be filled into the shaded squares to make the grid (now with ten...
A 5x5 Latin Square is a 5x5 grid of squares in which each square contains one of the numbers 1 through 5 such that every number appears exactly once in each row and column. A partially completed grid …
- 1,081
6
votes
1
answer
171
views
Determine the minimum number of numeric clues to make these mini-Sudoku puzzles have a uniqu...
Below are three grid layouts for mini-Sudoku puzzles.
For each type (Square, L and T), determine the minimum number of numeric clues you (as puzzle composer) would have to place in the grid so that th …
- 21.3k
7
votes
1
answer
586
views
Fill this Sudoku variant so that the sums of numbers in the outlined regions are all different
Place numbers in the grid so that each row and each column contain all the numbers {1,2,3,4,5} (each exactly once) and the sums of numbers in the outlined regions are all different.
Attribution: mom …
- 17k
8
votes
3
answers
802
views
Fill the grid with numbers to make all four equations true
Using all the numbers {1,2,3,4,5,6,7,8}, each exactly once, fill each empty white square with a number so that all the horizontal and vertical equations are true. The grey squares are not used.
Att …
- 1
4
votes
4
answers
854
views
Fill a grid with numbers so that each row/column calculation yields the same number
Using all the integers 1 through 9, each exactly once, put a number into each square in the grid below so that the result of each row and column calculation is 5.
All operations are performed "left to …
- 10.6k
31
votes
1
answer
4k
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 & @apaultaylor.
- 1
4
votes
3
answers
838
views
Eliminate some numbers so that each of the three rows contains the numbers 1 through 9 each ...
Beginner puzzle
This puzzle is intended to be suitable for people who are new to puzzle solving.
Clarification: Both experienced solvers and new solvers are welcome to post solutions to this puzzle.
…
- 1
10
votes
2
answers
621
views
Fill the triangular grid using the digits 1-9 subject to the constraints provided
Fill the grid using the digits 1-9 four times each. No row or column can contain the same digit more than once. The total of each row and column is provided, as well as clues to the numbers forming th …
- 103
4
votes
1
answer
434
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 …
- 7,321
8
votes
6
answers
1k
views
Are circles required on the edge of the grid?
The image below is a puzzle from the FlowFree app:
The image below is my solution to the above puzzle:
The rules stated in the app are:
Drag to connect matching colors with pipe, creating a flow.
Pa …
- 21.3k
0
votes
Are circles required on the edge of the grid?
This solution is a slight simplification of the nice solution posted by Yout Ried.
Grid:
Solution:
- 21.3k
7
votes
2
answers
381
views
Product = Sum Sudoku (Royal Statistical Society Christmas Quiz 2023)
Normal Sudoku rules for this grid size apply. The product of the numbers on each pink diagonal equals the sum of the numbers in the blue square.
This puzzle is from the now closed contest at: https …
- 7,321