The ads in this game are too invasive on my device settings. Ads may be a necessary evil for the game to be free but, when ads take over control of my device, that's BS! At first, you could skip an ad and continue playing. Now ads are on a timer and eat up battery life until the timer ends. Then, you get hit with multiple ads with timers and the ads can override system settings such as screen orientation. If possible, this game would get ZERO stars! Back to Sudoku on paper!