12×12 Queens puzzles

The biggest boards on the site, and the longest solves. Place 12 queens: one per row, column and color region, none touching.

1. #1Easy
2. #2Expert
3. #3Easy
4. #4Medium
5. #5Expert
6. #6Easy
7. #7Medium
8. #8Medium
9. #9Medium
10. #10Medium
11. #11Medium
12. #12Hard
13. #13Easy
14. #14Easy
15. #15Easy
16. #16Medium
17. #17Medium
18. #18Medium
19. #19Easy
20. #20Easy
21. #21Medium
22. #22Hard
23. #23Medium
24. #24Medium
25. #25Expert
26. #26Medium
27. #27Expert
28. #28Hard
29. #29Easy
30. #30Easy

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