Pro Tip

Always update pencil marks immediately after placing a digit — stale marks cause almost all solving errors.

Pro Tip
✓ Completed! 👍
8
6
1
4
3
6
3
7
2
9
7
3
9
4
8
2
5
6
1
3
9
4
5
5
4
7
9
9
4
5
6
2
5
3
6
2
4
9
2
4
7
8
1
1
3
5
4
2
9
Food for Thought

"Associate yourself with people who are likely to improve you." — Seneca

Food for Thought