best way to explain it is to…well, explain it.
the goal of each stage is to get your marble into the goal, but it's not as simple as just moving the marble around the stage until you reach the goal. you can move the marble left and right at the start of each level to decide where to drop it, but once you drop it gravity does the rest. the only other thing you can determine before dropping the marble is its weight. you can adjust the weight of the marble from 0 to 10 and this actually does have a bit of bearing on how the marble behaves, specifically when 