The game is played by linking same colored gems and similar symbols together. These links, when cleared off the playing field generate points and the longer and abundant the link is, the more points it will generate.
The objective of each level differs slightly by the introduction of different types of obstacles. These obstacles might be directly linked to the completion of a level, i.e. you must unlock all chests to complete the level, or the trick might be to simply reach a specified score while boulders block your links!