There is this new addicting puzzle game called "Okay?" developed by Philipp Stollenmayer for iOS devices iPhone, iPad and iPod Touch. There's only one goal in the game and that is to clear board with one line.
'Okay?' app has a very simple game format and minimal visual graphics but the good thing about it is that it is challenging yet fun. It stimulates the mind and is perfect for killing some time. One of the best app to pass time when you're on a train or just waiting for someone.
While it has minimal graphics, the interface is clean and looks professional. It's a free to download app by the way. However, you can choose to support the developer by paying what you want. You will be prompted with choices of amount that you want to pay once you finished the game. It's a short game with only 75 levels at the moment but it's worth your time.
Meanwhile, if you are looking for solutions to some specific level in this game you can find it in
Okay? App walkthrough posted below.