Confusing 90s pet puppy game

[Mochisweet]

Hi guys I just found my childhood virtual pet puppy after 20 years. However I cannot for the life of me understand the game on the right. It’s a rock game. A button makes it jump up and b supposedly makes it come down. There’s no way to win the game though. Here’s how many ways to lose: 

1. Rock touches you

2. You jump and rock doesn’t touch you

3. you jump and rock touches you when you come down

I totally don’t get it. Can anyone give me some ideas?