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Killer-Sudoku 4 hardcore: Die schwierigsten Rätsel&hellip by Stefan Heine
1 of 1 people found the following review helpful
5.0 out of 5 stars The ultimate challenge, 13 May 2012
Without question the most challenging and rewarding killer sudokus out there. The Times ones are a walk in the park in comparison with few of them taking more than 30 mins in our household. Some of these are still unfinished weeks later, so if don't mind being stretched a bit, this book is great vfm.