These are all 3 dimensional problems which can be drawn in 2 dimensions using a standard isometric grid. They can all be mapped onto a rectangular grid so can be easily solved by the Sudoku Solver Program. A few solved examples are shown here, in each case we show both the isometric representation and the flat rectangular representation.

The templates for these rectangular representations are included in the download page.

Tred01 iso grid

Tred01 cart grid

In this problem there are 7 3*3 boxes and only 6 “rows” and 6 “columns”. Two each of the rows and columns are highlighted. This should be enough to show how they are all mapped.

Tred02 iso grid

Tred02 cart grid

This problem has 8 3*3 boxes, 6 “rows” and 9 “columns”. All the rows and columns are obvious except for one set of 3 which are all highlighted. Note that there is no connection whatsoever between the cells in the top left box and those in the box to its right.

Tred03 iso grid

Tred03, cart grid

This problem has 7 3*3 boxes and 6 “rows” and 6 “columns”. All the rows and columns should be obvious except for one group of 3 columns which are highlighted.

Tred04, iso grid

Tred04, cart grid

A problem with 10 3*3 boxes, 6 “rows” and 12 “columns”. In the rectangular representation I found it easiest to leave an empty square in the middle. There are still some “interesting rows and columns and I have shown 1 from each group of 3. It should then be obvious how the other rows and columns are connected.