Make your way through the forest fighting the monsters that hide among the trees! Match 3 or more gems of the same color with the monster to attack it. Match enough gems to eliminate the monster and pass through. If you don't do it fast enough, the monster will attack you! But fear not, there is a way to heal yourself. Match 4+ gems to make a heart bonus appear inside one of the gems. Collect it to restore some of your health.
Drag a gem to swap it with one of the adjacent gems to make a line of 3 or more gems of the same color. Make the matches of the same color with the monster to attack.