Category Archives: Puzzle Reviews

Reviews of preselected puzzles from published collections. Summary review table, and highlight analysis.

Puzzleproof’s Sudoku Extreme Is Good Basic


Finishing with no advanced moves, the Extreme Sudoku 2 collection proves less than extreme. However, the collection, including the last three selected puzzles, 154, 175 and 196, have many worthwhile examples of basic slink marking in action. In the Pzlpfx2 … Continue reading

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

Double Sweep Lessons From 112 and 133


Two rare double sweeps in the bypass show up this post. In Puzzleproof Extreme 122, it’s a 5-fill line; in 133, a 5-fill box. In each, 5 cells are free and two are claimed by two values, leaving a 3-fill. … Continue reading

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

Can Box Marking Be Extreme?


This post continues the Sysudoku Basic review of Puzzleproof Extreme Sudoku 2, with reports on 70 and 91. In the basic trace of Pzlpf2 70, there is the typical heavy bypass, and collapse in the 9: box marking list. The … Continue reading

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

Puzzleproof’s Extreme 2 is Box Marking Level


This begins a four post review of Puzzleproof’s Extreme Sudoku 2. The pre-selected puzzles are every 23rd puzzle starting with 7. All of the puzzles are solved in the bypass or in box marking. The review provides full tracing, and … Continue reading

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

Wrapping Up Nakamoto Extreme With 183


This post completes the review of the Nakamoto Extreme collection. The review table follows the finish of Nakex 183. A Sudokuwiki assisted solution of Nakex 183 continues with the second APE triggered by the first’s removal of 8r2c9. In this one, … Continue reading

Posted in Extreme Solving, Nakamoto, Puzzle Reviews | Tagged , , , , , , , , | Leave a comment

Nakex 183 Hides the Keys


The last review puzzle, Nakamoto Extreme 183, follows the collection’s pattern of hiding easier removals behind methods that are very difficult to spot. An effective defense is to maintain bv maps, X-panels, and coloring clusters carefully as more advanced results … Continue reading

Posted in Extreme Solving, Nakamoto, Puzzle Reviews | Tagged , , , , , , | Leave a comment

An Orphan Takes Down Nakamoto Extreme 163


In this post, AIC building is replaced by BARN’s, conventional chains, coloring, and a noteworthy pattern analysis result. Nakex 163 basic starts with a 3-fill. The bypass contains six more. Two resolve into clue and naked pair, and one, into … Continue reading

Posted in Advanced Solving, Nakamoto, Puzzle Reviews | Tagged , , , , , | Leave a comment