Waste of Time and Money.com

Select a style:

Choose your poison...

9x9 Wodoku is the normal, everyday sudoku with an optional side of hardcore puzzling.

16x16 Wodoku is already literally dripping with hardcore, and there's even a button to cover it in (nearly) impossible.

Standalone Wodoku is a downloadable program that includes both variants above. Just in case you need to take breaks.