Code a Bouncing Ball Game

Open the Scratch website or app and click Create to start a new blank project.

Delete the default cat sprite by selecting it and clicking the trash icon.

Add a Ball sprite from the sprite library or draw a round sprite and place it near the top center of the stage.

Add a Paddle sprite by painting a rectangle or choosing one and move it to the bottom center of the stage.

Create three variables named xVelocity yVelocity and score for all sprites.

On the Ball add a "when green flag clicked" script that goes to x:0 y:100 sets xVelocity to pick random -4 to 4 sets yVelocity to 8 and sets score to 0.

On the Ball add a forever loop that changes x by xVelocity changes y by yVelocity and changes yVelocity by -0.5 each loop to simulate gravity.

Inside that Ball loop add an "if touching Paddle" block that sets yVelocity to 8 changes xVelocity by pick random -1 to 1 and changes score by 1.

Inside the Ball loop add an "if y position < -170" block that uses the "stop all" block to end the game when the ball falls below the stage.

On the Paddle add a "when green flag clicked" forever script that if key right arrow pressed change x by 10 and if key left arrow pressed change x by -10 so you can move the paddle.

Click the green flag to play and tweak numbers like xVelocity yVelocity or the gravity value until the ball bounces and feels fun.

Share your finished bouncing ball game on DIY.org