1. Control the bat with arrow keys - "left arrow" key to turn anti-clockwise, and "right arrow" key to turn clockwise to help the bat avoid bumping into the chick

2. Press "space" key to switch backdrops

3. When the bat touches the chick, have "uh oh" in speech bubble and say "uh oh!"

4. When the chick touches the bat, say "uh oh!" (no speech bubble)