This is the world's easiest game and the objective is simple : move the ball from one end to the other.
Originally released in May 2012, it was one of the first games (or apps) I ever made for Android. An updated version (2.0) was added in August 2015.
Play Store : https://play.google.com/store/apps/details?id=deisgns.abs.worldseasiestgame
The aim of the game is to move the ball from left to right along the groove, but you need to figure out how to do it. Sometimes it's as simple as dragging it across but other levels require you perform various gestures (eg. Pinch), shake the device amd hold it in a particilar direction.
The 2015 update added 10 more levels to the game as well as the ability see the output of your device's compass, gyroscope and accelerometers to help you with levels.