Don't bother putting all the numbers in. Our "Number Map" algorithm is intelligent enough to give instant solution to any problem, including partially filled ones. You can navigate back and forth between the different solutions.
Having a robust solver is great. Having a randomly generated puzzle section is better. Just choose your difficultly setting and off you go. There is a handy hint feature too, for a more casual experience.
Sudokus are crazy. There a are like a gazillion possible combinations that fit the grid. You can randomly generate each one these (because why not). There is a pause button too, in case you fall in love with one.