In Tennis with Myself, you play with yourself in cooperation with yourself. Try to bounce the ball as many times as possible without letting it touch the ground.
A smash gets you 100 points, a power smash 200, and a lob 10 points.
When the ball touches the ground, the points are multiplied by the number of hits achieved.
You can play with two people if you use the keyboard and controller together
I still recommend using a controller, preferably in solo mode.
Have fun, you and your doppelganger!