Good, but could improve**

Lost two stars because: requires you to watch an ad every time you open app and sporadically while playing.
**Also, on the "fifth element," and other challenges in the "element" series (moving rings from one post to another), the movement of the rings makes it difficult to complete in time, even if you know exactly what you are doing...the rings just kind of slowly float down when you drop them, and it wont let you pick up another until that first one has landed--very frustrating, and seems like it would be a straight forward fix.
I also wish they would add some more (and more types of) games.

Jennitho18 about Brain Puzzle - Mental & Brain Teasers