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`Sudoku Dragon (minimum numbered Wazir's tour)`

Complete the grid with orthogonal links between adjacent cells such that it's a valid sudoku grid with a hamilton path and the 81 entries along the path form the minimum 81-digit number.

1 2 7 6 5 8 9 3 4

8 3 6 7 9 4 1 2 5

5 9 4 2 1 3 8 7 6

9 8 2 1 4 5 7 6 3

7 5 1 3 2 6 4 9 8

6 4 3 9 8 7 2 5 1

3 6 9 8 7 1 5 4 2

4 7 8 5 6 2 3 1 9

2 1 5 4 3 9 6 8 7

Starts from: R3C5=1

Finishes at: R1C7=9

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`Sudoku Dragon 1.5 (minimum numbered Wazir's near circuit)`

Complete the grid with orthogonal links between adjacent cells such that it's a valid sudoku grid with a hamilton near circuit (i.e. the starting and finishing cells must be diagonally adjacent) and the 81 entries along the circuit form the minimum 81-digit number.

1 4 8 9 6 7 2 3 5

3 2 9 4 5 8 1 7 6

5 6 7 2 1 3 4 8 9

8 9 2 1 4 5 7 6 3

6 7 1 3 2 9 8 5 4

4 5 3 7 8 6 9 2 1

9 8 5 6 7 4 3 1 2

2 3 6 8 9 1 5 4 7

7 1 4 5 3 2 6 9 8

Starts from: R3C5=1

Finishes at: R2C6=8

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`Sudoku Dragon 2 (minimum numbered King's tour)`

Complete the grid with orthogonal and diagonal links between adjacent cells such that it's a valid sudoku grid with a hamilton path and the 81 entries along the path form the minimum 81-digit number.

1 2 8 4 3 7 9 6 5

4 9 3 5 6 2 1 7 8

5 7 6 9 8 1 3 2 4

2 8 9 6 1 5 7 4 3

6 3 4 2 7 9 8 5 1

7 5 1 3 4 8 6 9 2

8 1 5 7 9 4 2 3 6

9 6 2 8 5 3 4 1 7

3 4 7 1 2 6 5 8 9

Starts from: R2C7=1

Finishes at: R9C9=9

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`Sudoku Dragon 3 (minimum numbered King's circuit)`

Complete the grid with orthogonal and diagonal links between adjacent cells such that it's a valid sudoku grid with a hamilton circuit (i.e. the starting and finishing cells must be adjacent) and the 81 entries along the circuit form the minimum 81-digit number.

1 2 6 4 3 9 5 8 7

4 8 3 5 7 2 1 9 6

5 9 7 6 8 1 3 2 4

2 5 8 9 1 6 7 4 3

9 3 4 2 5 7 8 6 1

6 7 1 3 4 8 9 5 2

8 1 5 7 6 4 2 3 9

7 6 2 8 9 3 4 1 5

3 4 9 1 2 5 6 7 8

Starts from: R2C7=1

Finishes at: R2C8=9

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`Sudoku Dragon 4 (minimum numbered Knight's tour)`

Complete the grid with knight-movement links between cells such that it's a valid sudoku grid with a hamilton path and the 81 entries along the path form the minimum 81-digit number.

1 6 4 3 9 8 7 5 2

7 5 3 2 6 4 9 1 8

9 2 8 5 7 1 4 6 3

4 3 7 1 2 9 5 8 6

8 1 5 6 3 7 2 4 9

6 9 2 8 4 5 3 7 1

3 8 1 7 5 2 6 9 4

5 4 6 9 1 3 8 2 7

2 7 9 4 8 6 1 3 5

Starts from: R2C8=1

Finishes at: R5C1=8

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`Sudoku Dragon 4.5 (minimum numbered Knight's near circuit)`

Complete the grid with knight-movement links between cells such that it's a valid sudoku grid with a hamilton near circuit (i.e. the starting and finishing cells must be diagonally adjacent) and the 81 entries along the circuit form the minimum 81-digit number.

1 7 5 9 4 3 8 6 2

4 6 3 2 7 8 5 1 9

8 2 9 5 6 1 3 4 7

9 3 4 1 2 7 6 8 5

7 1 8 4 5 6 2 9 3

6 5 2 8 3 9 4 7 1

3 9 1 6 8 2 7 5 4

5 8 7 3 1 4 9 2 6

2 4 6 7 9 5 1 3 8

Starts from: R2C8=1

Finishes at: R1C7=8