Belly Bounce is an online activity that was hosted on the Knowledge Adventure website from around 2010 to 2023. It's based on the classic arcade game Pong, and is intended to be played with two players. Each player can choose a JumpStart character to play as, and then take turns bouncing a ball back and forth and trying to score goals against each other. Technically, you can play it solo - if you use the A and Z keys with your left hand to control one character, and use the up and down keys with your right hand to control the other character. Maybe it could be considered an exercise in multi-tasking.