education

Did you solve it? Clueless sudoku


Earlier today I set you three ‘clueless’ Sudoku and an ‘almost clueless’ Killer Sudoku. For discussion and tips you can read the original column here.

For a printable page of all the puzzles click here. Scroll down for the solutions.

1) A 4×4 clueless Sudoku

Fill the grid with the numbers from 1 to 4 such that no number appears more than once in each row or column, and that the numbers in each region add to the same sum.

puzzle

(Since there are 2 regions, and the sum of all numbers in the full grid is 40, each region will sum to 20.)

2) A 5×5 clueless Sudoku

The rules are as above, but with digits from 1 to 5. Each region must sum to 15.

puzzle

3) A 6×6 clueless Sudoku

The rules are as above, but with digits from 1 to 6. Each region must sum to 14.

puzzle

4) A 6×6 almost clueless Killer Sudoku

Fill in the grid with the numbers from 1 to 6, with no number appearing more than once in each row, column or region (the six-cell blocks marked in bold). The numbers in each cage (marked by dashed lines) must sum to the total marked in that cage.

Solutions

1. and 2.

clueless solutions

3.

solution

4.

solution

I hope you enjoyed the puzzles – feel free to share solving techniques below the line. I’ll be back in two weeks.

I set a puzzle here every two weeks on a Monday. I’m always on the look-out for great puzzles. If you would like to suggest one, email me.

I’m the author of several books of puzzles, most recently the Language Lover’s Puzzle Book. I also give school talks about maths and puzzles (restrictions allowing). If your school is interested please get in touch.

Thanks again to Gerard Butters, Frederick Hale, James Henle, Colleen McGaughey and Philip Newman for today’s puzzles.



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