How do rubbers affect gameplay?

Rubbers control how much sidespin and chop you can apply to your returns.

Sidespin allows you to curve the ball. This can throw off your opponent and it also makes the ball harder to return. Chop (aka backspin) allows you to kill the speed on the ball.

Sidespin and chop lessons feature in the training area alongside a counter spin lesson which teaches you how to respond to incoming spin.