Before you can access Double Pack-a-Punch in Attack of the Radioactive Thing!, you'll need to first make sure power is on and you have unlocked the base Pack-A-Punch.
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How To Open Pack-A-Punch
Then simply obtain the Crowbar, collect a set of Alien Fuses, and charge them using the Electric Trap. Once completed, you'll be able to upgrade weapons with Double Pack-a-Punch for 10,000 points, giving them a unique animated molecular camo.
Step 1: Pick Up the Crowbar
Your first objective is to collect the Crowbar. This can be found in the pool area near the Bombstoppers perk machine. Pick it up and keep it ready, as you'll need it shortly.
Step 2: Collect the Alien Fuses
Locate any active Pack-a-Punch portal and enter it to travel to the Projection Room.
Inside, find the wall-mounted button and hold the interaction key until you hear a click and the button changes colour. Immediately leave through the portal before the timer expires.
You will be teleported into one of the trailers within the Trailer Park. Turn to your left and look towards the damaged electrical cabinet mounted on the wall. Use the Crowbar to smash it open and reveal the Alien Fuses hidden inside.
Pick up the fuses carefully. Avoid jumping while interacting with them, as this can occasionally cause issues with the pickup. The easiest way is to just look at the bottom of the cupboard and interact.
Step 3: Charge the Alien Fuses
To charge the fuses, you'll first need the Cleaver. This weapon can be found embedded in the dead shark located at the Beachside Market.
Once acquired, use the Cleaver to score melee kills on zombies or Crogs until your green vial is completely charged.
Next, head to the Power Station and locate the electrical trap. If the trap component is missing, search the nearby rubbish bins for the missing part, install it, and ensure the power is switched on.
Stand in the centre of the power generators until the screen begins to shake, then place the Alien Fuses on the ground. A pool of glowing green radioactive goo will appear around them.
Activate the Electric Trap and allow it to run through a full cycle. When the electricity stops, the fuses will have transformed and will now glow purple. Pick them up to continue.
Step 4: Unlock Double Pack-a-Punch
Find the currently active Pack-a-Punch portal and enter it once again.
Before interacting with the machine, make sure you're holding a weapon that has not already been Pack-a-Punched. This avoids a known glitch that can prevent the process from working correctly.
Interact with the Pack-a-Punch machine to install the charged Alien Fuses. Once completed, Double Pack-a-Punch will be unlocked, allowing you to spend 10,000 points per weapon to receive the upgraded molecular camo and enhanced weapon effects.
