Roleven app for iPhone and iPad
Roleven is a simple puzzle game - all you have to do is collect 11 using simple math.
Develop a strategy to try and top the leaderboards or just (semi)mindlessly add numbers up to 11 to kill time and unlock achievements.
~There is no paid version of the app, everything is included in the free version.
~Theres only one in app purchase, to remove the ads that play between levels.