Every serpent is armored, thus their open mouths -- exposed during bite attacks -- are weak points. Initially, only the four bronze serpents will attack; once they are all dead, the blue serpent slithers away for a separate battle with players.
Tower is a quintet of Hydra-like serpents: four reddish-bronze snakes, and a larger crested blue serpent. Appearing together, they erratically bob their necks before attempting to bite the player(s); shooting a serpent's open mouth makes it recoil and damages Tower. The rest of their bodies are invulnerable to gunfire.
After the four bronze serpents are killed, the blue serpent escapes to either a reservoir or sandpit (depending on the player's route through the third chapter). Until death, it will repeatedly slither around for a charging bite attack.
Tower was derived from geneticist Dr. Roy Curien's mad research; after Curien's death in the 1998 Curien Mansion Incident, his financier Caleb Goldman developed Tower and other creatures for the next two years. Goldman released them in Venice, Italy on February 26th, 2000, scheming to decimate humanity and preserve the life cycle.
AMS dispatched agents to investigate, including James Taylor and Gary Stewart. After their rendezvous with partners Amy Crystal and Harry Harris, Goldman left a phone message inviting them to meet him at the Roman Coliseum in the north side of Venice. Although fearing a trap, the party continued and split up; James and Gary entered the sewers, where they found Tower killing several civilians. The agents defeated the creature.
James and Gary would battle Tower again in Goldman's headquarters, but killed it like before.
The Tower is the third boss in The Pinball of the Dead. Unlike its appearance in 2, Tower is composed of three serpents instead of five, and they can also shoot fireballs. The player must hit two of the serpents once, with the remaining one requiring more hits before dying.
In its first phase, all snakes (except the blue one) will attack with their mouths. Most of the time, 1 snake will attack. Sometimes, 2 snakes will attack the agents at the same time. The player must shoot it's mouth at the right time or else receiving damage. The player must dealt 3 shots on each snake, during which it'll die and never rise up again.
The blue snake will slither free when all four snakes are dead, thus beginning the second phase. During this phase, the blue snake can charge an attack while sliding. It will then rise up and bite its target. The snake will move in different patterns, so shoot as quickly as possible. It'll repeat the process until it is killed.
Inside the Goldman Building, the Tower reappears and the player must beat it, but this time, the blue snake joins the 4 other snakes to bite the agents. Also, there is no second phase for the boss.
- Tower might have been based on the Hydra from Greek mythology.
- Tower has a slight resemblance to Serris from Nintendo's Metroid Fusion.
- Tower's roars were recycled from King Kong's roars that were used in the 1976 remake. The roars were provided by veteran voice actor Peter Cullen.
- In The Typing of the Dead and The Pinball of the Dead, the four reddish-bronze snakes have been reduced to two. This is mostly because it will be difficult for players to answer questions (this applies to The Typing of the Dead, not The Pinball of the Dead).
- Tower makes a cameo appearance in Sonic & Sega All-Stars Racing as an obstacle in the "Curien Mansion: Sewer Scrapes" track. It also reappears in the "Graveyard Gig" track in Sonic & All-Stars Racing Transformed with a containment tube. During the second lap, it breaks out and escapes to the sewers.