STEP 1
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Go to Pack a Punch by linking the teleporter pads in building 2. Once you're in the Pack room, float behind the Pack a Punch and in the cockpit you'll see a green card. Pick it up.

STEP 2
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Walk into building 1 right as you walk in the door. On the right there is an electrical panel. Place the card in there and wait 1-2 rounds while it encrypts. Then open up the pyramid.

STEP 3
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Once the pyramid is opened, shoot the summoning key and follow it around the map. It will stop three times along the journey. Each time you have to shoot it to make it keep moving. First stop is on the hill outside building 1. The second place it stops is in the top right corner of the door to building 2. The third stop it will come to rest in the Mule Kick room inside of a dish on the wall. Shoot it off the dish and it will fall to the ground. Pick it up.

STEP 4
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Go to the double tap room and place the Summoning Key inside the electrical field. This will cause the top floor of the power building to go into lockdown. No one will be allowed to go in or out of that room for 1-2 rounds. Once over, the lockdown will end and you'll be able to pick the key up once again.

STEP 5
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Go to the top floor of the spawn building. Right as you come up the stairs there will be a radio playing static on a desk. Play the radio.

STEP 6
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Go to the top floor of the teleporter building. The truck from Shadows of Evil will teleport into the room automatically. Place the Summoning Key in the wooden crate on the back. On the truck's right side against the wall there's a control panel. Activate that to teleport the cargo

STEP 7
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Go back to where you went for step 5 and listen to the radio again. Once done the secret vault door will be able to be unlocked.

STEP 8
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Open the door and there will be 3 rewards. A D13 Sector wallbuy, a gobblegum machine, and the buyable ending for 66,666 points. End the game and break the cycle.