Click on the green flag to begin. Click on any of the lines to select them. (The black lines are just bars and the blue line is a trampoline). Once an object is selected you can angle it by using the left and right arrow keys. Press the space bar to place an object. Press the a key to make the ball go. Press the a key again to make the ball reset. Try to get the ball to hit the cage so you can trap the mouse.
Thank you snowstate for all of your help! Thanks penguinbella for the mouse! Anything you want me to add? Put your suggestions in the comments! Thanks!