Wilgje.net

Killah Sudoku!

Yesterday I solved my first killer sudoku. I bought this nice red and black book which looked dangerously complicated, because regular sudokus have me yawning within five seconds. I must say, this is a whole new way of making a sudoku and quite tough at the start. Look at this example:

The idea is probably clear: the numbers have to be filled in like in an ordinary sudoku, but the joined fields have to amount to the number written in the line around those fields. So, the upper left field and the one below that have to add up to 10. That is either 4+6, 7+3, 8+2 or 9+1, so that’s an impossible place to start. If two fields add up to 3, you can say for sure you need a 1 and a 2 in them. In that way there are many more handy combinations you can find, and a lot of deduction is needed to get somewhere. All in all though, it’s a lot of fun, and much more challenging.