The game has 2 playing mode: classic mode and task mode. With classic mode, you need to match as much elements as possible before the time runs out. In task mode, you will have to collect the required amount of elements to pass the level.
So, if you find its a little bored when playing Jewels, Jewels Star, Jewels Maze,... why don''t you give Hexa Elements Blast game a try! It will become your next favorite game for sure!