Diamond L(2,3) D(22,11,10,1,1,0)
Difficult
Here the shapes are pushed over to become diamonds. This wraps side to side but not top to bottom.

Film L(2,1) D(22,6,5,0,0,0)
Moderate
Similar to the regular 9 by 9 Sudoku but the squares have lumps in the top and bottom. The problem wraps top to bottom but not side to side so the overall geometry is a cylinder.

Jigsaw L(2,1) D(22,6,6,0,0,0)
Moderately easy
As regular 9 by 9 but the normal 3X3 boxes are irregular shapes

Sudoku 9X9 L(1,1) D(27,5,5,0,0,0)
Easy
This is the standard geometry that is usually seen. Characters must not repeat in rows or columns or in any of the 3 by 3 boxes that are outlined.

Toroid H L(2,3) D(20,13,12,3,1,0)
Difficult
The normal 3X3 boxes are replaced by horizontal stripes (helices) which wrap around the problem. These stripes join the left side to the right side and the top to the bottom so that the overall geometry is a doughnut (torus).

Jigsaw L(2,1) D(21,8,7,0,0,0)
Moderate
As regular 9 by 9 but the normal 3X3 boxes are irregular shapes.

People L(2,3) D(16,22,22,2,2,0)
Difficult
The shapes have “lumps” on each side to become quite irregular. They look to me like little people. This problem wraps top to bottom and side to side so the overall geometry is like a doughnut (torus).

Samurai L(2,1) D(110,10,9,0,0,0)
Not difficult, just tedious due to the size of the problem
Effectively 5 intersecting 9 by 9 Sudoku problems.

Sudoku 9X9X L(1,3) D(21,16,15,3,1,0)
Difficult
As regular 9 by 9 but must also have unique characters in each diagonal, highlighted.

Toroid V L(2,3) D(17,16,16,3,1,0)
Difficult
The normal 3X3 boxes are replaced by vertical stripes (helices) which wrap around the problem. These stripes join the left side to the right side and the top to the bottom so that the overall geometry is a doughnut (torus).

Diamond L(2,1) D(22,8,7,0,0,0)
Moderate
Here the shapes are pushed over to become diamonds. This wraps side to side but not top to bottom.

Fishnet L(2,1) D(35,6,5,0,0,0)
Easy
This is like a regular 9 by 9 Sudoku with holes in it.

Sudoku 9X9 L(1,1) D(26,5,5,0,0,0)
Easy
This is the standard geometry that is usually seen. Characters must not repeat in rows or columns or in any of the 3 by 3 boxes that are outlined.

Sudoku 9X9X L(1,3) D(19,20,19,4,1,0)
Difficult
As regular 9 by 9 but must also have unique characters in each diagonal, highlighted.

Toroid H L(2,1) D(19,6,5,0,0,0)
Moderately difficult
The normal 3X3 boxes are replaced by horizontal stripes (helices) which wrap around the problem. These stripes join the left side to the right side and the top to the bottom so that the overall geometry is a doughnut (torus).

Film L(2,2) D(21,17,16,2,0,0)
Moderately difficult
Similar to the regular 9 by 9 Sudoku but the squares have lumps in the top and bottom. The problem wraps top to bottom but not side to side so the overall geometry is a cylinder.

People L(2,3) D(16,26,25,4,4,0)
Difficult
The shapes have “lumps” on each side to become quite irregular. They look to me like little people. This problem wraps top to bottom and side to side so the overall geometry is like a doughnut (torus).

Samurai L(3,1) D(102,11,11,0,0,0)
Moderately difficult due to size of problem and use of letters instead of numbers
Effectively 5 intersecting 9 by 9 Sudoku problems.

Sudoku 9X9X L(1,1) D(20,9,9,0,0,0)
Easy
As regular 9 by 9 but must also have unique characters in each diagonal, highlighted.

Toroid V L(2,3) D(17,16,15,1,1,0)
Difficult
The normal 3X3 boxes are replaced by vertical stripes (helices) which wrap around the problem. These stripes join the left side to the right side and the top to the bottom so that the overall geometry is a doughnut (torus).

Jigsaw L(3,3) D(21,12,12,1,1,0)
Very difficult, partly due to the “diabolical” character set
As regular 9 by 9 but the normal 3X3 boxes are irregular shapes

Samurai L(2,1) D(116,6,6,0,0,0)
Moderately difficult, main issue is the size of the problem
Effectively 5 intersecting 9 by 9 Sudoku problems.

Sudoku 9X9 L(1,1) D(27,6,5,0,0,0)
Easy
This is the standard geometry that is usually seen. Characters must not repeat in rows or columns or in any of the 3 by 3 boxes that are outlined.

Sudoku 9X9X L(1,2) D(21,13,12,1,0,0)
Difficult
As regular 9 by 9 but must also have unique characters in each diagonal, highlighted.

Toroid H L(2,3) D(17,15,15,3,3,0)
Difficult
The normal 3X3 boxes are replaced by horizontal stripes (helices) which wrap around the problem. These stripes join the left side to the right side and the top to the bottom so that the overall geometry is a doughnut (torus).