Interlude: The Upgrade Machine

By this point, the enemy waves have likely gotten high enough that even standard zombies are bullet sponges. Before you continue to battle with forces beyond your comprehension, it’s time to upgrade.

If you’ve done any exploration, you may have found your way into the Catacombs. The easiest way to reach them is through the Morgue past the spike trap, or to unlock the gate in the sewers underneath the village square. Whichever way you choose, the centerpiece of the Catacombs is the upgrade machine, which is currently blocked off by an iron cage.

There’s a switch on one of the columns near the MP-40 weapons locker. Press it to activate the disposal tubes. There are a total of three; it costs 250 Jolts to enter and doing so sends you to the Catacombs, where you drop into one of three small alcoves. Here are their locations:

1. At the base of the Tower; accessible via a gate past the Bridge just outside the Pub.
2. In the Command room of the Bunker.
3. In the Laboratory on the wall near the electrical trap.

Each alcove contains a button; each one partially raises the cage off the upgrade machine. After pushing all three buttons, you can finally upgrade your hardware!

While you’re at it, now is a good time to unlock any closed gates in the village. Doing so will come in handy later and it’s worth some easy EXP. If you have any leftover Jolts, feed them to the Mystery Box for a chance at a Jack-in-the-Box decoy grenade.