Remove all gems by building vertical, horizontal or diagonal rows of 5 gems or more.
Removing longer rows or multiple rows at once gives bonus points and bombs.
To move a gem, first click on the gem, then click on an empty field. Bombs are moved in the same way, but they explode after moving (or when double clicked).
Clearing the whole board increases the level. Higher levels give much more points, but higher levels are also much harder to play.