The official Black Ops 2 on Steam is a broken mess. The "Full Game" you paid $60 for no longer works properly due to security vulnerabilities. The Plutonium client fixes that, but the real magic of the "Full Game" concept is the
: "Pluto" might refer to the Roman god of the underworld, making the game potentially themed around mythology, the underworld, or even a science fiction setting involving the dwarf planet Pluto. pluto-t6-full-game
To summarize your path to glory:
If you enjoy narrative through gameplay and secrets, the T6 Zombies maps contain a deep "Easter Egg" storyline. The official Black Ops 2 on Steam is a broken mess