The Natural World is under attack by the MuckMonger Pollution Army of evil Mucklings and MuckMares! This dark army is now assaulting the entrance to Deep Earth where the Heart of Nature is kept. They must not be allowed to enter or all will be lost! But Nature is not completely defenseless! - Natural Guardian Spirits have emerged from the Deep Earth to defend Nature against the onslaught of the Mucklings and MuckMares - but we need your help! Merge the Natural Spirits to create stronger Guardians and strategically arrange them on the Last Patch in front of the entrance to Deep Earth to fight off the never-ending waves of Mucklings and defeat the MuckMare bosses.