Board Thread:Questions and Answers/@comment-24204380-20141209143933/@comment-24009015-20141212204527

I'm already Level 15 in less than a week.

There are "Spies" that roam around your Game Center Friends. Pop all 5 and you get a Bloonstones for yourself and your friend!

Attacking is now easy, as you just choose an attack type, similar to those that appears as tiles and that's it. You'll get Bloonstones if you attack.

and that's about it