[Hartmann]

Paradox Junction doesn't hand out the Sundergat just because you've hit the Mystery Box a hundred times. It's a proper little quest, and it only starts once you've got the Blundergat built and in your hands. If you're still learning the map flow or you just want cleaner practice runs before you commit to long attempts, a CoD BO7 Bot Lobby can help you get the timings down without your squad melting the moment things get messy.



Build the Blundergat first
No shortcuts here. You need the four Blundergat parts, then you've got to assemble it at the Cul-de-Sac Workbench. It's the grimy wooden bench with the vise, and you'll be coming back to it a lot, so learn the route and keep that area in your head. If you try to force the upgrade steps without the crafted weapon, nothing "fails" in a dramatic way—it just doesn't happen, and you'll waste rounds wondering what you missed.



Blue-flame tornado zombies and the bench kill
After rounds, keep an ear out for that sharp crackle and look for the blue vortex effect. Those blue-flame fire tornado zombies are the real gate. The common mistake is panic-shooting them wherever you spot them. Don't. You need to bait them to the workbench like you're lining up a trick shot you can't afford to miss. Kill the first one right next to the bench with the Blundergat. Then do it again with a second one, same spot, same weapon. Too far away and it won't count, which means you're stuck waiting for more spawns while the map gets less forgiving.



Tortured Mimic, then the timeline swap
Once the second blue-flame zombie drops at the bench, a Tortured Mimic shows up. He's chunky, and he'll happily ruin your day if you let him corner you. Keep moving, keep your space, and make sure the finishing damage happens right by the workbench. After that, you're into the timeline trick. Paradox Junction flips between the clean "Past" Nuketown and the wrecked "Present." Head to the Past version (wait for the shift or pay for the golden portal), find the workbench there, and give it a melee hit to interact. Place your gun down, then jump back to the Present. That swap is what completes the change, and you'll see the payoff when you return.



Little things that ruin runs
Rad-Hounds are the sneaky problem. Their radioactive burst can mess up your train and force you to kill the blue-flame zombie early, nowhere near the bench. In co-op it's even worse, because one teammate can "help" by deleting your target across the map. Call it out, ping the bench, and tell everyone to stop shooting the blue-flame one until it's where you want it. If you're low on essence or you're trying to speed up portal access and upgrades, a lot of players use U4gm
for game currency and items, which can take some of the grind pressure off while you focus on nailing the Sundergat steps.

[Hartmann]