As others have previously said, the sudoku is done very well in Brain Age. Even though there are only 100 puzzles and it does not have a puzzle generator, it doesn't matter because it's not like you are going to remember the puzzles at all. I like how it keeps a record of how long it took to solve the puzzle, so if you redo a puzzle, it at least provides a little motivation to beat the previous time. There is the ability to pause and save a puzzle, but that particular puzzle must be solved before starting a new puzzle or that previous work will be lost.