Water Drop Free is a trail version of the complete Water Drop mobile game which can be bought here: https://itunes.apple.com/us/app/water-drop/id886086557
Water Drop Free contains 7 playable levels of the more than 20 fun and exciting puzzles that can be played in the full version.
The full game description can be found below.
Water Drop is an adventure puzzle game set within a water pipe. Play as Blue through over 20 challenging levels that will test your ability to problem solve your way to the exit. Using motion of the device to guide your way through the maze, and reach the puddle waiting for Blue at the end. Each level incorporates new aspects of gameplay; and obstacles for you to avoid range from Laser and Sponges to Wrenches and Flying Screwdrivers!