Mastering the primary storyline in Call of Duty: Infinite Warfare's retro map requires patience, precise shooting, and careful map navigation. Players must complete a sequence of elaborate tasks to trigger the final encounter and claim their ultimate reward. This comprehensive guide outlines the exact phases needed to conquer the undead theme park and successfully retrieve the coveted Soul Key.

Building and Deploying the Seti Com Device

The journey begins with assembling a custom communication device by locating three distinct items scattered across the amusement park. Survivors must scour the environment for a hidden calculator, a retro boom-box, and a discarded umbrella. Once all components are collected, players must hand them over to DJ David Hasselhoff, who will construct the necessary defense tool.

After retrieving the completed device, you must locate areas where your screen shakes violently to place the tool down for defense phases. Surviving these protection stages requires holding down specific positions against aggressive waves of zombies for increasing durations. Successfully defending the device three times allows you to advance directly to the main stage setup.

Surviving the Simon Says Puzzle and Clown Waves

With the defense phases out of the way, players must navigate to the main portal area to initiate a massive light puzzle with the overhead flying saucer. The hovering alien spacecraft will flash a sequence of four distinct colors that must be matched identically using speakers placed around the central plaza. Inputting the sequence incorrectly penalizes players by spawning dangerous brute enemies into the arena.

Completing the color puzzle immediately triggers a massive survival round comprised entirely of explosive clown enemies. Players need to keep moving constantly and utilize powerful explosive variants of the starting pistol to manage the chaotic crowd. Surviving this relentless onslaught will force the final boss creature to descend into the park for a direct confrontation.

Defeating the Alien Boss and Destroying the UFO

The final boss fight demands constant movement and high precision as you target the glowing modern amulet worn by the invading extraterrestrial creature. Players must deal sustained damage until the alien collapses onto its knees, exposing a vulnerable state where a melee attack can knock away its power fuses. This difficult process must be repeated multiple times until the powerful boss is entirely defeated.

Once the alien is down, collect the dropped fuses and insert them directly into the Pack-a-Punch machine to unlock double weapon upgrades. To finish the map entirely, players must use their enhanced blasters to shoot the blue rings located on the massive park entrance archway. Timing your final shot as the spacecraft flies overhead will destroy the vessel and drop the final Soul Key onto the portal floor.