7x7 Color Strategy
Another completely free game for you puzzle and strategy fans is 7x7 -- a color strategy game. You'll be playing something similar to Classic 5, but with mobile in mind.
You'll be using your brain and some strategy to figure out color-based puzzles, but watch out, you might get stuck. Don't worry though, you can quickly earn "move anywhere" power-ups that will help you out of a sticky situation. And no, those power-ups aren't impossible to get, and they won't try to get you to buy some. It's completely free.
You can undo a move if you made the wrong choice, track and save progress on Google Games, and have fun while keeping your brain fresh and challenged.