Sudoku finned X Wing: check the extra candidate before you erase
Sudoku finned X Wing helps advanced solvers test a nearly complete X Wing without turning a close pattern into an…
Sudoku candidate coloring: follow one digit without guessing
Sudoku candidate coloring helps players follow one digit through a difficult grid and separate useful links from unsafe guesses.
Sudoku hidden single box: find the number hiding in plain sight
Sudoku hidden single box helps players spot a number that has only one legal home inside a box.
Sudoku naked pair elimination: the quiet move that clears a row
Sudoku naked pair elimination helps players remove candidates cleanly when easy singles disappear from the grid.
Sudoku hidden singles technique: spotting forced numbers before notes crowd the grid
Sudoku hidden singles technique teaches solvers to find solitary candidates hiding inside rows, columns, and boxes before messy notes clutter…
Sudoku givens pattern: read the puzzle before notes
Sudoku givens pattern helps players read the starting numbers before crowding the grid with pencil marks.
Sudoku row scan order: why the first sweep should stay boring
Sudoku row scan order gives players a calm first pass before notes, guesses, or crowded candidates take over.
Sudoku candidate cleanup: erase less, solve more clearly
Sudoku candidate cleanup helps players remove bad notes without turning a calm grid into guessing.
Sudoku origin story: how a quiet Japanese grid reached London and the world
Sudoku origin story traces the number grid from Number Place to Nikoli in Japan and Wayne Gould bringing it to…
Sudoku row column box proof: the rule that still catches guesses
Sudoku row column box proof gives players a plain way to test every number before a tempting guess spreads.