E-book teaser: Killer Sudoku by Serkan Yürekli
Here is a (very hard) sample puzzle from the Killer Sudoku puzzle pack by Serkan Yürekli, which was just added to our e-store.
or solve online (using our beta test of Penpa-Edit tools)
Theme: Time Killer
Author/Opus: This puzzle comes from our managing editor Serkan Yürekli as part of his new e-book.
Rules: Standard Sudoku rules. Also, the sum of the numbers in each cage must equal the value given in the upper-left corner of that cage. Numbers cannot repeat inside a cage.
Difficulty: 4.5 stars
Time Standards (highlight to view): Grandmaster = 11:00, Master = 24:00, Expert = 48:00
Solution: PDF; a solution video from Cracking the Cryptic will be available here.
Note: Follow this link for more Killer Sudoku and this link for classic Sudoku. More Killer Sudoku puzzles can be found in Killer Sudoku by Serkan Yürekli.
16:23.Excellent puzzle.
Lesson #1000 to read the rules carefully before starting, even when I’m familiar with the puzzle type. Struggled for days until I noticed the “cannot repeat inside a cage” condition.
I haven’t done a recent survey, but last time I checked over 80-90% of Killer Sudoku sources use the no repeat rule within cages. You should still always read the rules (and check the title of a puzzle to know if it is a variation), but for this style we aren’t doing something out of the ordinary even though I’ve seen more heterodox puzzles with repeats allowed.