Tag Archives: Only Hard Sudoku

Bookends of the Only Hard


This post checkpoints the only sysudokie bypass casualty and the only sysudokie basic survivor, in this second review of Manuel Castillo’s Only Hard Sudoku collection. The report of my first review was posted 1 ½ years ago, March 29, 2016. … Continue reading

Posted in Basic Solving Procedures, Puzzle Reviews | Tagged , , , | Leave a comment

A Well Hidden Pair in Only Hard 128


This begins a brief review of Manuel Castillo’s Only Hard Sudoku, preliminary to reviewing his more recent Only Extreme Sudoku. Both books are wordless collections of 400 puzzles, with identical formats. Thanks go to officers, members and guests of the … Continue reading

Posted in Basic Solving Procedures, Puzzle Reviews | Tagged , , , | Leave a comment

Castillo’s Only Hard Sudoku


This post concludes that Manual Castillo’s Only Hard Sudoku book is for those sysudokies who enjoy the bypass challenge, and are not expecting a to get to many advanced techniques. So many puzzle books, so little time. This relatively recent … Continue reading

Posted in Basic Solving Procedures, Puzzle Reviews | Tagged , , , | Leave a comment