This is a challenge game rather than a tennis battle one. The gameplay of this kind of games is not rare, mainly testing the player's clicking skills and agility. Note that it doesn't let you click without rules. There are some hidden techniques to get high scores waiting for you to discover!
Gameplay: Click the tennis ball with your mouse to keep it from falling to the ground. The more times you click, the higher score you get. You have a total of five chances, and the "b" key is the "boss is coming" key.