ghostarrow
Lurker
It's a simple math game, in which you answer questions of increasing difficulty as fast as you can. The faster you answer questions the more points you get. Global high score tables are kept using scoreloop. Check it out, its got a free version that is supported by ads.
https://play.google.com/store/apps/details?id=com.gregoryscjr.Math_Agility_Free
https://play.google.com/store/apps/details?id=com.gregoryscjr.Math_Agility_Free