pick number -> place here!
This app also takes away most of the tedious things about sudoku. It takes away the pencil marks of a number once you place that number in a row/column/square! It also doesn't let you put in a wrong number but you lose a "life" and get a minute added to your time once you've used up all the lives.
And the Time Attack mode is something I've never seen before: all the numbers are penciled in already, and you just see how quickly you can fill it (GameCenter ranking)! Good for stress relief when you don't want to do all the hard work :)