Guides & tips

Tips, strategy, and how-to guides for every GridDay puzzle — from your first solve to expert speed.

• Sudoku tips for beginners

  New to Sudoku? Learn the rules, the first techniques to master, and the habits that make solving click.

• How to get faster at Sudoku

  Already solving? Cut your times with a fixed scanning order, pencil-mark discipline, and the techniques that pay off most.

• Killer Sudoku strategy

  Killer Sudoku adds cage sums to Sudoku. Learn the combinations, the Rule of 45, and how to open a fresh grid.

• Which puzzle should you play?

  Sudoku, Killer, Kakuro, Calcudoku, or Futoshiki? A quick guide to what each plays like and who it suits.