Its all about the Angles..
With Line Tennis, you control the ball by drawing a line to change the direction of the ball, if you get the angle right, you will get a hit. If not the ball keeps bouncing and you can try again.
You must hit 3 targets in 90 seconds to complete a level. For every level, you will be awarded either Gold, Silver or Bronze depending on how quickly you hit all 3 targets.
Avoid the grenades that randomly appear in some levels.