This is a surprisingly enjoyable brain teaser, casual, puzzle like game where you make fractals of one color. A fractal is a diamond of 7 diamonds / cubes / gems / whatever. 2 on the left, 2 on the right, 3 in the center. How do you arrange them? You simply click an emty space on the grid or the border of the level. When you click that empty space, the spaces around it push out with whatever color gem you have next in your que. Let's say green gem in your que you will push out in all directions shifting all the gems in all directions 1 space over. Like pushing lines in 6 directions. You only get a certain amount of 'pushes' per level. To beat a level you need to get X amount of points. When you make a fractal, other gems appear in the level, which may lead to a chain of fractals or mess you up. Sometimes you need to think 2 or 3 moves ahead and when different colored gems get involved you need to make sure one move doesn't mess up something else you've been planning.
There is a campaign, arcade and puzzle modes. Depending how good you are, a single play can last you around an hour if not longer without losing. The campaign won't take more than a few hours, but I can see there being replay value in the way that Tetris is replayable. While the score isn't a big focus of the game (no leaderboards), it still gets your brain going. There's no pressure or time limit, its soothing.
Fractal is not for everyone. Its very much a touch screen mobile game, but it is fun and engaging for a while.