SudokuVault Blog

Everything you need to know to pick up a Sudoku puzzle and solve it from start to finish. No math needed.

Every technique you need to solve Sudoku puzzles at any difficulty. Naked pairs, X-wing, swordfish, and more.

A guide to the best Sudoku puzzle books available right now. What to look for and which books are worth buying.

Download and print free Sudoku puzzles at every difficulty. New puzzles every week.

Large-print Sudoku books and tips for older adults. Keep your brain active with puzzles sized for comfort.

Sudoku and Kakuro look similar but play very differently. Here is how to tell them apart and which one you might prefer.

A comparison of the top Sudoku apps for iPhone and Android. Features, pricing, and which one to download.

Killer Sudoku adds caged sums to the standard grid. Learn the rules and the best strategies to solve them.

Samurai Sudoku uses five overlapping 9x9 grids. Learn how the overlap works and how to solve these massive puzzles.

Sudoku is great for kids. Start with 4x4 grids and work up to 6x6 before tackling the standard 9x9.

Solving one Sudoku puzzle every day builds focus, sharpens logic, and reduces stress. Here is how to start the habit.

Pencil marks are the key to solving medium and hard Sudoku puzzles. Learn how to use them with the naked pairs technique.

Sudoku started in a U.S. magazine, got popular in Japan, and took over the world. Here is how it happened.

Research on Sudoku and brain health. What the science says about puzzles, cognitive function, and mental fitness.

What makes a Sudoku puzzle easy, medium, hard, or expert. How difficulty is measured and what techniques each level requires.