The Advanced Sudoku Challenge

Difficult 9×9 Logic Puzzles for Experienced Solvers

Ready for a tougher test of logic? The Advanced Sudoku Challenge brings experienced solvers 90 difficult 9×9 puzzles designed to reward close observation, careful candidate tracking, and deductions that go beyond the obvious.

Take on one grid at a time and follow each possibility through the rows, columns, and boxes. The puzzles invite you to look for patterns, narrow choices, and build a chain of logical deductions—making each solve a focused exercise in patience and problem-solving.

90 difficult Sudoku puzzles for experienced solvers
90 numbered solutions at the back for checking your work or reviewing a puzzle
A how-to-use page to help you get started

Whether you enjoy a steady mental workout or prefer to settle in for a demanding grid, this collection offers a substantial set of puzzles to work through at your own pace. Keep track of candidates, revisit a tricky position, and enjoy the satisfaction of finding a sound path to the solution. Pick up your pencil and see where careful logic takes you.