WASD to move the red crab, arrow keys to move the blue crab. Hit the ball back and fourth with your friend / family member, or just anyone to see how many times you can hit it! Make sure not to go out of the box or you will go back to the spawn, not much of a big deal. And the reason and added the box thing was because there was a bug were you could get an infinite amount of points so yeah...
Credits to the game on google apps "Crabby Volly" on "Two Player Games The Challenge" Make sure to try that game out for yourself too!