The bosses of the four selectable levels were based off the four classic Greek elements (Earth, Fire, Air, Water)
There's four of them, and they have traits which can roughly be tied to one of those four elements at that.
- Desolation Canyon — Fire (Grand Dragon — a tank that attacks with a flamethrower and incendiary missiles)
- Gold Mine — Water (Giant Crab — a Giant Enemy Crab, and is thus modeled after a water-based creature)
- Armoured Train — Air (Flash Boy — a guy on a jetpack, who obviously flies through the air)
- Ammunition Depot — Earth (Geas Crystal — a snakelike robot which essentially has a giant gemstone over its core)
- The remake in Wild Guns Reloaded adds one more in Underground — Lightning (the boss has an electrical attack from its horns)
