Bananas are game objects that are collected when a match is made next to them. Unlike Crates, they are affected by gravity and can be swapped with. If the level goal requires more bananas than are visible on the level currently, new bananas will drop down 

 

Bananas can be goals – you have to collect them to pass the level, or they can be obstacles  - you don’t have to collect them to pass the level, but they make it more challenging to collect the items that are the level goal.