How to generate a sudoku with a unique solution
A sudoku generator step by step: a fast solver with bit masks, a random full grid, removing cells while checking for a unique solution, and difficulty.
Category
Crosswords & Puzzles
Crosswords, word search, sudoku and nonograms in one offline app. How the puzzles are generated and what's new.
How to generate an arrowword with a hidden message
A guide to generating Swedish-style crosswords: a hill-climbing mask, word filling as a backtracking CSP, and the hidden message found in the finished grid.
How to generate a word search with a hidden message
A word search generator with a hidden message, step by step: dictionary, word lengths, filling the grid without backtracking and success rates by grid size.