In the James Forest Classic Sudoku review, The next two pre-selected puzzles are solved in Basic, one in early line marking and one in the bypass. They are both excellent examples of the kind of Sudoku entertainment Basic level puzzles provide.
With Classic 93, the bypass was over quickly and box marking completed the 9’s. Then three lines in, a hidden single starts a rapid collapse. Along the way, you see a chain of identical bv 38 develop and collapse before reaching remote pair length.
Here is the grid, just after the naked single and hidden single, and just as the collapse is starting. Following a collapse, like box marking and line marketing, is a routine activity. But it is also satisfying, like knitting and whittling. The trace looks complicated to the uninitiated. But it builds itself, with simple, efficient steps.
On Classic 120, we have only the bypass to report. The trace spreads across the page, before dropping in the collapse, leaving many causes unused.
For Advanced only readers, Forest’s Classic 144 is worth waiting for. It requires a parade of boomerangs, and has a surprising Sysudoku finish.
After that, the Classic review finishes in Basic, along with reports updating another review . If you have a needed update in mind, let me know in a comment.