Killer Sudoku strategies
Plain-English guides to the techniques that solve Killer Sudoku puzzles without guessing. Start at the top and work down.
Cage combinations
Some cage totals can only be made one way. Learn the key ones.
Read the guideThe rule of 45
Every row, column and box adds up to 45. Use it to find single cells.
Read the guideNaked pairs and triples
Use pencil marks to clear candidates when two cells share the same two options.
Read the guide