I freeze as a blue-flame zombie drifts into my sightline, tornado of fire spinning like a warning flare. You have the Blundergat in your hands and one shot at getting this right. I’ll walk you through the exact sequence I use so the upgrade doesn’t waste your time or a round.
Short version: the Sundergat isn’t a separate drop — it’s the Blundergat’s main upgrade. When you finish the steps below the Blundergat transforms into a weapon that hits like a wrecking ball, changing how you clear Paradox Junction.
How to get the Sundergat upgrade in Black Ops 7 Zombies Paradox Junction
The Cul-de-Sac workbench looks ordinary: scratched wood, oil stains, a metal vise — but it’s the anchor for this upgrade. Treat that bench as mission control and don’t let panic make you rush the sequence.
Step 1 — Own a Blundergat. You must have crafted the Blundergat first. I covered the four-part craft route in a separate guide; if you play on PlayStation, Xbox, or PC (Steam), the parts and bench interaction are identical thanks to Treyarch and Activision’s map scripting.
How do you upgrade the Blundergat to Sundergat?
Complete a round and wait for a blue-flame zombie trapped in a fire tornado to spawn. Don’t shoot that one. Clear surrounding trash mobs so you can guide the blue-flame zombie without it getting eaten by accident.
Drag that flaming zombie to the Cul-de-Sac bench — the same bench you used to craft the Blundergat — and kill it there with your Blundergat. The kill must occur while the zombie is adjacent to the bench. After that first kill, another fire-tornado zombie will spawn; repeat the same maneuver.
After both blue-flame zombies die at the bench, a tortured Mimic will spawn. The Mimic’s tougher; bring it near the bench and finish it with the Blundergat as well. Killing the Mimic by the bench is the trigger you want.
Do I need to return to the past Nuketown map?
Yes. After the Mimic dies by the bench in the present Paradox Junction, travel to the past version of Nuketown. Melee the same bench in the past, then place the Blundergat on it. Warp back to the present (the destroyed Nuketown) and watch the animation as the Blundergat becomes the Sundergat.
Once upgraded, the gun behaves differently: it draws attention and stores power in a way that makes hordes clump around you — it can feel like a magnet for zombies, which is perfect for controlled crowd-management if you’ve got a plan.
Where do the fire-tornado zombies spawn and how to spot them?
They spawn periodically after round completion and are obvious: blue flames and a small vortex. Audio cues help too — the fire crackle is louder than normal zombie noise. If you play with voice chat on platforms like Discord or party chat on Xbox Live and PlayStation Network, call the spawn fast so teammates don’t accidentally finish it off.
Troubleshooting tips: don’t place the Blundergat on the bench early, don’t shoot the blue-flame zombies at range, and keep a clear lane to lure them. If someone else accidentally kills a fire-tornado zombie, reload and wait; it will respawn in later rounds but resetting wastes time and momentum.
I’ve tested this on PC/Steam and console builds; Treyarch’s map scripting is consistent, so the timing and bench interaction match across versions. Ready to turn your Blundergat into a Sundergat and test how long it holds the line?