However, I believe the coins lost don’t count when determining your star rating: the total number of coins collected, not the current score, is what matters. For attractions where you can be hit by opponents or run into obstacles, you lose a small number of coins whenever you collide. For some attractions, certain actions will also earn you points (which is illustrated by having coins “burst” out of your character). The coins you collect determine your score and are picked up by moving over them.
In order to unlock a chapter, you must play all of the preceding chapters, but once unlocked, you can replay any chapter in any order.
Most attractions are divided up into chapters. The basic premise for almost all of the attractions is to follow the course from the start to the finish, collecting coins and trying to find secrets. Each of the attractions in Disneyland Adventures is named after (and located at) an actual ride in Disneyland but rather than simulating the actual rides, they are mini-games that you can play.