The object of the Bejewled game is to score as many points as possible by swapping adjacent gems to create sets, either horizontal or vertical, of 3 or more identical gems.
Swap any two identical adjacent gems by clicking on one, then the one you want to swap it with. The gems must be adjacent vertically or horizontally (not diagonally).
Sets can be either horizontal or vertical, and can contain more than 3 gems. When you have successfully created a set, they will disappear and new gems will fall into place, possibly creating a chain reaction or cascade of more sets.