How to play the Knockers game
If you're ever bored and you've got a few mates around you should learn how to play Knockers.
You will need
Ball
Wall
2 or more friends

 

Rules of the game

 

First sort out an order.  
The first person serves the ball by bouncing it on the ground and making it hit the wall.

Then the second person follows and hits the ball on the ground to hit the wall.
The next people do the same and the last person in wins.  

 

Ways to get out
Hitting the ball against the wall on the full.
Double touch of the ball and bounce.  
Interference is a redo  
The aim of the game is to get all of the people out.