3Gdoku rules

 

4X4

Each square should be filled with one number and one letter. The numbers (1-4) form a normal sudoku and the letters (A-D) form a normal sudoku. Only the "3G-doku" rule, 'No two squares can contain the same number-letter pair.' lets you solve either sudoku.

5X5

Each square should be filled with one number and one letter. Each row and each column should contain all the numbers from 1 to 5 and all the letters from A to E. Each number should be paired with each letter once, and only once.

9X9

Each square should be filled with one number and one letter. The numbers (1-9) form a normal sudoku and the letters (A-H & J) form a normal sudoku. Only the "3G-doku" rule, 'No two squares can contain the same number-letter pair.' lets you solve either sudoku. The extra grid helps you keep track; but remember to fill it in as you go along.

This is an altogether new sudoku development, and I am, at this time, the only person who can supply these puzzles. (True at the time of writing (For a certain value of true.))

These puzzles are graded in a way that reflects how they are solved by real people. (The level B test is 'Is there only one letter or number that can fit in this square.) I can supply them in .TIFF and .pdf formats. Batches of puzzles can be purchased for publication.
Contact me for prices.

3Gdoku puzzles have been published under the name of
'Two-doku' and 'Jigsaw-Doku'. Names such as - 'Sugodoku', 'Duodoku' and 'Twindoku' are all going begging. Names such as - 'Graeco-Roman Sudoku', 'Graeco-Latin Sudoku' and the Byzantinely obscure 'Mutually Orthogonal Sudoku' would strike a chord with the mathematicians of this world.