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Level 1
Level 2
Level 3
Level 4
Level 5
Level 6
Level 7
Level 8
Level 9
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Congratulations!

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Utility: Works for the entered candidate (even if it is wrong)

Single Candidate
Hidden Singles
Pointing Pairs
Box Line
Naked Pairs Triples
Hidden Pairs Triple
Naked Quads
Hidden Quads
Strong Chains
Strong Chains from selected cell
clear
Log

Color:

Congratulations. Record your time.

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Record
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Rules

❶Each row must contain all of the numbers 1 through 9 and no two numbers in the same row of a Sudoku puzzle can be the same.
❷Each column must contain all of the numbers 1 through 9 and no two numbers in the same column of a Sudoku puzzle can be the same.
❸Each block must contain all of the numbers 1 through 9 and no two numbers in the same block of a Sudoku puzzle can be the same.

Select a cell from the 9x9 puzzle, and enter a number using the number keypad or the memo number keypad.
By double-clicking on a cell, you can keep entering the same number you chose on the keypad. You can erase a number by entering that same number.

C: Clear the cell
UNDO: Go back one move
RESTART: Reset the puzzle
CHECK: Tells you if you have made a mistake
HINT: Shows you the next move
POSSIBLE CHOICES: Automatically sets the possible choices.

Lv.1-4:Single Candidate, Hidden Singles, Naked Pairs Triples, Hidden Pairs Triple, Naked Quads, Hidden Quads, Pointing Pairs, Box Line
Lv5:Singles Chains, X-wing, Y-wing, XYZ-wing, SwordFish
Lv6:X-cycles, BUG, XY-chain, 3D Medusa, Jellyfish, Unique Rectangles
Lv7:SK Loops, Extended Unique Rectangles, Hidden Unique Rectangles, WXYZ-wing, Aligned Pair Exclusion
Lv8:Hidden Unique Rectangles, WXYZ-wing, Aligned Pair Exclusion, exocet, Grouped X-cycles, Empty Rectangles, Finned X-wing, Finned SwordFish
Lv9:Empty Rectangles, Finned X-wing, Finned SwordFish, AIC (Alternating Inference Chains), Sue-de-coq, Digit Forcing Chains, Nishio Forcing Chains, Cell Forcing Chains, Unit Forcing Chains