Quad Clue Sudoku is a brand new Sudoku variant by David Millar from The Griddle.
UPDATE : Quad Clue Sudoku is based upon the original Quadruple Clue Sudoku by Henry Kwok (sorry Henry but it was never the intention to not mention you as the inventor of Quadruple Clue Sudoku, if only we had known before).
The latest quad clue Sudoku sheet contains nine Sudoku puzzles to solve. Each Quad Clue Sudoku puzzle contains features a six by six Sudoku grid with four numbers at some of the grid intersection points. These four numbers correspond to the four numbers in the four adjoining squares. It’s another way of providing starting clues, without telling you exactly where they are. Happy Puzzling!
Tags: Quad Clue Sudoku | Sudoku