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New colour ✎
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AC
Lock Grid
Unlock Grid
Clear Unlocked
Export Grid
Import Grid
Check Solved
Toggle Extra Panel
Generate Sudoku
Fill Pencil All
Fill Pencil Accurate
0. Reduce possibilities
1. Hidden Singles
2. Naked Pairs/Trips
3. Hidden Pairs/Trips
4. Naked/Hidden Quads
5. Pointing Pairs
6. Box/Line Reduction
7. X-Wing
8. Simple Colouring
9. Y-Wing
10. Swordfish
11. XYZ-Wing
12. X-Cycles
13. BUG
14. XY-Chain
15. 3D Medusa
16. Jellyfish
17. Unique Rectangles
18. SK Loops
19. Extended Uniq. Rect.
20. Hidden Uniq. Rect.
21. WXYZ-Wing
22. Aligned Pair Exclusion
23. Exocet
24. Grouped X-Cycles
25. Empty Rectangles
26. Finned X-Wing
27. Finned Swordfish
28. Altern. Inference Chains
29. Sue-de-Cog
30. Digit Forcing Chains
31. Nishio Forcing Chains
32. Cell Forcing Chains
33. Unit Forcing Chains
34. Almost Locked Sets
35. Death Blossom
36. Pattern Overlay
37. Quad Forcing Chains
38. Trial and Error