Hidden pairs is one of those techniques that feels like magic the first time you use it. Two candidates are hiding in plain sight, locked into just two cells — and once you see them, you can eliminate everything else from those cells and often unlock a chain of progress. This guide explains what hidden… Continue reading on Hidden Pairs in Sudoku — How to Spot and Use Them

If you have worked through easy and medium puzzles without much trouble but keep hitting a wall on hard difficulty, the X-Wing technique is probably the missing piece. It sounds intimidating but the logic behind it is clean and satisfying once you see it. This guide explains exactly what X-Wing is, when to use it,… Continue reading on X-Wing Sudoku Strategy: How to Spot and Use It