19
votes
Accepted
10
votes
Accepted
8
votes
Accepted
The Master Tetrist
Gladys is at
Here is the filled in grid:
Answers to clues:
Across
Down
I must say I did not use the tetris aspect at all, but just solved the first few clues across/down and worked from there.
- 55k
7
votes
Accepted
Manhattan distance
The place to start is:
Now let us place:
Moving down the chain:
And the next:
You guessed it:
Finishing up:
- 29.2k
7
votes
Accepted
6
votes
Accepted
The minimal Anti-Sudoku
Strategy
We already have a computer solution, so I will try to show how a human can obtain it. The strategy is to set the numbers $1,2,\dots,9$ on the anti-sudoku grid one by one. Let $A$ be the ...
- 622
5
votes
Fill a grid with numbers so that each row/column calculation yields the same number
It is possible to find a solution by hand using more logic and less bruteforcing/guessing.
First use Someone's insight:
Also note the number 5:
and the symmetry of the grid:
Make an educated guess:
...
- 17k
5
votes
Fill a grid with numbers so that each row/column calculation yields the same number
One possible solution is:
I found this by
I'm not sure
- 8,470
4
votes
Accepted
One number grid, two ways to divide it (Part 2)
The least common multiple of 3 and 4 is 12, so the smallest grid must have 12 of each number, with a total area of 48 units. Three rectangular grids of this size have solutions.
The 3 x 16 rectangular ...
- 16.8k
4
votes
Manhattan distance
Since someone beat me to it, I won't post the solve path, but only the key observation, that
The solve is easiest if you
and the full solution is
- 2,172
3
votes
Fill a grid with numbers so that each row/column calculation yields the same number
Nothing clever here, just a programmed evaluation of all permutations.
There are three essentially different solutions:
Each of these can be manipulated through row/column swaps and/or reflection ...
- 16.8k
3
votes
3
votes
2
votes
Accepted
Pinwheels - Colombian Sudoku
You can solve the problem via integer linear programming as follows, with binary decision variables $x_{ijk}$ to indicate whether cell $(i,j)$ contains digit $k$:
For each region (row, column, or $2\...
- 15.5k
2
votes
Accepted
Ying Yang 12x12 - Colombian Sudoku
Via integer linear programming, using the formulation described in my answer https://puzzling.stackexchange.com/a/128031/65277:
- 15.5k
2
votes
1
vote
Accepted
Fill a grid with numbers so that each row/column calculation yields the same number
Based on other answers that already classified all solutions to the original puzzle, here is an observation that one can solve the puzzle with an additional constraint. Namely one can request that all ...
- 2,064
1
vote
One number grid, two ways to divide it
When I posted the puzzle, I had a solution whose lower half is different from Jujustum's:
- 17k
Only top scored, non community-wiki answers of a minimum length are eligible