This challenge is directly related to solving, creating, or otherwise working with sudoku puzzles.

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10
votes
1answer
624 views

How many Sudoku puzzles exist?

This is not a Sudoku solver, nor a Sudoku checker. Your challenge is to write a function or script that, given as input the "block" size of a 2D Sudoku puzzle (which is 3 for the classic 9x9 board, 4 ...
5
votes
3answers
956 views

Build a Killer Sudoku Solver

You thought regular sudoku was hard, now try Killer Sudoku! In the game of Killer Sudoku, you aren't given any numbers at all. Instead, you're given regions that are said to add up to a certain ...
10
votes
0answers
776 views

Minimal Sudoku Generator [closed]

Ask questions if you need to, I'll elaborate on anything that needs clarified. My challenge is to unsolve a sudoku to a minimal state. Basically take a supplied, solved, sudoku board and unsolve it ...
6
votes
1answer
1k views

Sudoku board generator

A program that randomly generates a Sudoku game board with varying degrees of difficulty (however you decide to measure difficulty). Sudoku requires that there is only one solution, so your program ...
6
votes
0answers
455 views

Unique Sudoku Finder

Challenge: Given a Sudoku board on standard input, find the minimum number of numbers added to make the board unique. Specifics/Rules: The input is formatted as follows (all whitespace is ...
14
votes
11answers
2k views

Implement a Brute Force Sudoku Solver

Implement the shortest Sudoku solver using guessing. Since I have received a few request I have added this as an alternative question for those wishing to implement a brute force sudoku solver. ...
19
votes
3answers
2k views

Implement a Non-Guessing Sudoku Solver

Implement the shortest Sudoku solver. Sudoku Puzzle: | 1 2 3 | 4 5 6 | 7 8 9 -+----------------------- A| 3 | 1 | B| 6 | | 5 C| 5 | | 9 8 3 -+----------------------- ...