The best sudoku app, hands down. – Sudoku X4U Review

There are several variations of the game in this app to choose from, each with several levels of challenge, but the best game is 4XU's jigsaw game. I have been doing a puzzle or more every day for several years. There are other jigsaw sudokus out there but for me, this is the best by far.
Review by Janiel2452 on Sudoku X4U.