Check points
Checkpoints cost twenty fruit to unlock. Because the game gets progressively more difficult consider using unlocking your first checkpoint after the first three levels. After that, try to last as long as possible while unlocking every other checkpoint before you are forced to unlock every checkpoint. Do this when you get to the point where everything is extremely difficult. Also consider doing this after passing extremely challenging areas.
Fruits
Collect fruits to unlock checkpoints. Once collected, those fruits in a level will be gone forever. However if you skip one or more and reach a checkpoint to save your progress, you cannot return. It always makes sense to collect all the fruit before reaching a checkpoint.
Levels
A new level will become available daily. All levels that are unlocked while the game is installed can be accessed at any time. However there may be levels that became available before you started playing. If this is the case, they can be unlocked by watching a video advertisement. To replay a level, tap the "Settings" icon then tap a day on the calendar. If you have to unlock that level beforehand, a lock will appear on that date. If you already unlocked it, you can tap the day to play it.