2. If the silver ball has too many rebounds before all the goals are met, you lose.
3. Very Interesting: Look at the 2nd image. See the black circles that resemble clocks? When the silver ball passes over them, certain reflectors change direction. Most of the reflectors: you can change the direction by tapping. But not all.
4. Love This: You can pause the round midway to rethink how you're going to get the last set of red balls.
Level 9 I thought was impossible. Clever problem.
The paid version has 24 levels for $.99.