Pro Tip

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

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

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

Food for Thought