Crab Diggers: Deep Blue Game is a kid friendly casual matching game that is free to play and includes a singular in app purchases to remove advertisements for $2.99.
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Pros
Pro Easy to play
The control scheme is simple to use and understand being that the player only uses their thumb to tap on the left or right side of the screen to rotate the the squids in each corresponding direction.
Pro Google Play Games leaderboards and achievements
Crab diggers allows users to sign in with their Google+ account in order to compete with friends and strangers in a global leaderboard as well as accrue achievements for completing certain tasks in game.
Pro Single in app purchase to remove ads
For users that want to remove the advertisement from the bottom of as well as the full screen ads between rounds from the game there is a single in app purchases of $2.99 that will remove them permanently.