Classic game of Pong from 1972. To play simply click on the green flag and when the game begins, use your mouse pointer to move the green paddle left and right to try to intercept and return the ball. One point for every return. If the ball bounces on the red line, one penalty point will be deducted.
This Scratch project was really easy to create and based on an idea I had previously seen but apologies that I can't actually remember who the original creators were.