Lockout Line Sudoku
The rule: A lockout line’s diamond ends differ by at least 4, and every digit between them falls outside that range.
Play unlimited Lockout Line puzzles free — every one generated with a unique solution, rated by the solving techniques it actually needs.
- Four difficulties, from gentle to expert
- Step-by-step hints that teach, not just tell
- Interactive lessons and a daily race
- Make and share your own puzzles