# Problems

## Problems 2013-05-27

Backslash L(2,3) D(22,8,8,1,1,0)

Difficult

Must have unique characters in each row and column but the 3 by 3 boxes are replaced by backslashes. These wrap left to right and top to bottom so the overall geometry is a doughnut (torus)

Diamond L(2,1) D(25,5,5,0,0,0)

Moderate

Here the shapes are pushed over to become diamonds. This wraps side to side but not top to bottom.

Jigsaw L(2,1) D(23,5,5,0,0,0)

Moderate

As regular 9 by 9 but the normal 3X3 boxes are irregular shapes

Samurai L(2,3) D(114,14,13,1,1,0)

Difficult

Effectively 5 intersecting 9 by 9 Sudoku problems.

Toroid H L(2,3) D(19,13,12,1,1,0)

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).

## Problems 2013-05-20

Backslash L(2,3) D(21,14,13,2,1,0)

Difficult

Must have unique characters in each row and column but the 3 by 3 boxes are replaced by backslashes. These wrap left to right and top to bottom so the overall geometry is a doughnut (torus)

Diamond L(2,3) D(24,11,10,1,1,0)

Difficult

Here the shapes are pushed over to become diamonds. This wraps side to side but not top to bottom.

Jigsaw L(2,1) D(26,5,4,0,0,0)

Moderate

As regular 9 by 9 but the normal 3X3 boxes are irregular shapes

Sudoku 9X9X L(1,1) D(24,4,4,0,0,0)

Easy

As regular 9 by 9 but must also have unique characters in each diagonal, highlighted.

Toroid V L(2,3) D(20,19,19,3,2,0)

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).

## Problems 2013-05-13

Diamond L(2,1) D(22,9,8,0,0,0)

Easy to Moderate

Here the shapes are pushed over to become diamonds. This wraps side to side but not top to bottom.

Film L(2,1) D(25,9,8,0,0,0)

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.

People L(2,3) D(19,9,9,1,1,0)

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).

Sudoku 9X9X L(1,1) D(22,5,4,0,0,0)

Easy

As regular 9 by 9 but must also have unique characters in each diagonal, highlighted.

Toroid H L(2,3) D(21,11,11,1,1,0)

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).

## Problems 2013-05-06

Backslash L(2,1) D(22,7,6,0,0,0)

Moderate

Must have unique characters in each row and column but the 3 by 3 boxes are replaced by backslashes. These wrap left to right and top to bottom so the overall geometry is a doughnut (torus)

Diamond L(2,1) D(28,5,4,0,0,0)

Moderate

Here the shapes are pushed over to become diamonds. This wraps side to side but not top to bottom.

Film L(2,1) D(27,7,6,0,0,0)

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.

Samurai L(2,1) D(117,5,4,0,0,0)

Relatively easy but a large problem

Effectively 5 intersecting 9 by 9 Sudoku problems.

Toroid V L(2,3) D(21,9,8,1,1,0)

# Solutions

## Solutions 2013-05-27

## Solutions 2013-05-20

## Solutions 2013-05-13

## Solutions 2013-05-06