Play any type of Game at Y8.com. The biggest Game Collection to play free online. Flash, Unity 3D, Html5, Android, Java and Shockwave.
If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Play 30 Tricky Levels in which you have to sum all the numbers under a set of rules.
You will be satisfied with your math if you clear all the Levels.