Thomas Snyder (aka Dr. Sudoku) is a two-time World Sudoku Champion and five-time US Puzzle Champion, as well as the author of several books of puzzles. His puzzles are hand-crafted, with artistic ...

SHIKAKU: you don't want to get one of these. In part three of my diary I mentioned some Japanese... When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...