Getting to the Blue Key Slot (11)

Guide Duke through the 'Under the Ride' and 'Hub' areas to reach the 'One Eyed Pete's Shooting Gallery' and use the Blue Key.

Alright, let's get this Blue Key slot sorted out. We're heading into level 11, and it's a bit of a maze, so stick with me.

Under the Ride

First off, you're gonna be underwater here. Watch out for three Octabrains and six Slimer Eggs. There's also a Trooper chilling in a cup, so take him out. Grab the box of Shotgun Shells in the corner. The Trooper was guarding a Portable Medikit in that cup, so snag that too. You'll see a grate in the wall – that leads back to the Underwater fountain in the Hub area, which is where we need to go next.

Hub

Head back to the Hub. Look for some boxes; you can use them to get up to a ledge. Up there, you'll find some Pipebombs. You'll also see a broken part of a bridge. Jump onto it and grab the Atomic Health sitting on a small raised platform. From there, you need to get into the window. Inside, there's Pistol Ammo and some RPG Ammo. There's also a monitor you can check. Looking in it will show you a door in front of the 'One Eyed Pete's Ride' area. This is the door you need to open to progress. To open it, you'll need to hit the switches. Hit the bottom one on the left side, and then both switches on the right side. Once that's done, head over to the 'One Eyed Pete's Ride' area you just unlocked.

One Eyed Pete's Shooting Gallery

You're now in the 'One Eyed Pete's Shooting Gallery'. You can use the Blue Key on the Blue Key slot right here, which is what we came for. There's also a booth with a Pig Cop guarding another box of Shotgun Shells – take him out and grab the shells. When you're ready, go through the revolving door. Inside the ride itself, you'll find three Pistols on the counter and a Large Medikit in the corner. The shooting gallery part has five targets and some ducks that move around. Keep an eye out for two Atomic Health pickups that are with the ducks. Behind the five targets, there's an RPG and a Small Medikit. Make sure you grab that secret – it's actually mandatory to beat this level, so don't miss it!