Tred 01 L(2,1) D(27,5,0,0,0,0)
Moderate
Tredoku 3 dimensional problem 01 with 7 faces, 6 rows and 6 columns

Toroid H L(2,4) D(18,26,5,4,1,0)
V 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).

Sudoku 9X9 L(1,1) D(26,16,0,0,0,0)
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.

People L(2,4) D(20,12,1,1,1,0)
V 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).

Diamond L(2,2) D(22,15,2,0,0,0)
Moderate
Here the shapes are pushed over to become diamonds. This wraps side to side but not top to bottom.