Blek is unlike anything you've ever played before. Unless you tried it after Google gave it a few awards over the years. It's not a new game, but such a piece of art it had to be included.
Blek has players drawing lines or gestures on the screen, and if done right, that same gesture floats down the screen and connects dots to pass the level. It sounds odd, but you'll understand after watching their video. It's like making art, playing a relaxing game, and challenging your brain all at in one. Some have called it a stroke of genius, and it won multiple awards in the best casual game category.
Basically, players must shape a line, that if done right will collect all the dots later down the screen. It uses skill and thought processes unlike anything else, and is a beautiful masterpiece yet extremely simple. It's amazing how fun this little game is.