Let’s move on to a sudoku.
The first Five-pair Sudoku I saw was written by Vladimir Portugalov. Several followed in his Forsmarts website and his 24HPC sets. I like solving medium-ish puzzles so I keep that difficulty in mind when I’m constructing. Unless I’m out to get you (like a heavy-pointer in a puzzle set or a giant puzzle for last year’s WPC) I’m generally nice to solvers. 🙂
Five-Pair Sudoku: Classic sudoku rules apply. Additionally, each 10-cell grey area should contain two identical sets of 5 digits. The two grey areas may contain different sets.