Although Sudoku can be fun, it is not an activity that lends itself to "killer images". Try finding a friend interested in Sudoku and discussing interesting games.

Kakoru or kakuru is a cross between sudoku and crossnumbers puzzles. There's also "killer sudoku" which is just a larger grid size (12x12 or 16x16.)

Pyramid sudoku is a regular sudoku board with shaded areas. Not only does one need to complete the regular sudoku, but the shaded areas can only have 1-9 as well.

All the rules to regular sudoku apply as well as each number in each "cage" (the boxes with dotted lines) must be unique and add up to the number inside the cage.

The game you are thinking about it Sudoku

http://en.wikipedia.org/wiki/Sudoku The game you are thinking about it Sudoku

http://en.wikipedia.org/wiki/Sudoku