2021 World Sudoku+Puzzle Convention Organizer
Posts: 2003
 Location: India | Same colours are start and end of a path and must be connected. The path will become an extra region. Lines are just walls blocking the path as in a maze. There are no Irregular regions, there is no concept of regions beyond a path. Personally I like Riad's version better for crossover round, without regions, players will say it is not a Sudoku. |