Practice📖 Learn the rule first ▸
Geometry
Non-Consecutive
Orthogonally touching cells can never hold consecutive digits.
Tips
- ◆Every placed digit forbids the two either side of it in all four neighbours.
- ◆Middle digits bite hardest: a 5 blocks 4 and 6, while a 9 only blocks 8.
- ◆Diagonal neighbours are unaffected — only shared edges count.
Drills