Obnoxious, and not always in a good way.
The core game itself is fine--well constructed, and while some of the puzzles are too easy, it at least gives you a variety of skill levels to choose from.
Unfortunately, theyve seen fit to include some extremely intrusive ads to the game--some of which can make the game embarrassing to play in public, and some of which even include sound and video.
Until they can a little less obnoxious to play, Ill be deleting this from my phone, and I highly recommend skipping it if youre considering downloading it.
Ienai about Cross Fingers, v3.1.0