In my game I have 20 stages. Here are 3 of my stages and how I tuned them.
Limited Time:
In this stage, you have a limited time to destroy all blocks.
Double Paddle:
In this stage, you have to control 2 paddles. One at the top, one at the bottom.
Shrinking Paddle:
In this stage, every time the ball hits the paddle, the paddle shrinks. (Hard to notice in gif, sorry!)
