Getting the Yellow Key (8)

You're starting in the first level of the hotel. Right off the bat, you've got three Pig Cops to deal with at the entrance. After you clear them out, head down the hallway. Your first stop is the room on the right – it's a ruined washroom. Inside, you'll find an RPG, Devastator Ammo, and three Large Medikits. Grab 'em all, you'll need 'em.

Continue following the internal perimeter of the building. Keep an eye out for snack machines; there's Shrink Ray Ammo sitting right on top of the cola machines and another Large Medikit near the snack ones. The Yellow Key door isn't too far from here.

You'll spot some RPG Ammo tucked away in a corner. Grab it, but then make sure you stay in that corner. This is a prime spot to dish out some serious damage to some tough enemies that are about to come your way.

Look into the open room directly in front of you. This is where you want to toss a bunch of your Pipebombs. You might get jumped by some Captains, but if you're lucky, you'll take them out before alerting the two Battlelords chilling in there.

Once the Pipebombs have done their work, detonate them and finish off any remaining Battlelord with your RPG or Devastator. These guys hit hard, so don't mess around.

In the area where the Battlelords were, you'll find Chaingun Cannon Ammo and a box of Shotgun Shells on the ground. There's also Pistol Ammo on the counter.

Now, check the big switch on the wall. Flipping it opens a small door behind you. Inside, you'll find Night Vision Goggles – super handy if you plan on exploring darker areas later. The medical compartment nearby has a Portable Medikit. On the left wall, there are a bunch of white drawers; one of them can be opened to reveal Body Armor.

Moving on to the Hotel Front: You'll see two glass doors, which are the main entrance. There are Shotgun Shells and a Small Medikit right by the door.

As you step outside, be ready! To your left, some windows are going to open up, and a whole mess of Enforcers and Pig Cops are going to rush you. Some annoying RPVs will join the fray too. This is definitely the spot to unleash that RPG you picked up earlier.

After you've dealt with the ambush, jump through those windows you saw opening. You'll land in a small room.

Inside this room, there's a Devastator on a table, two Large Medikits on a bookshelf, and another one on a different shelf.

Now for the key: look for a painting on the wall, situated between two vases. Open that painting – it's a secret door!

As you step through the newly opened door, watch out! A Commander will attack you from outside the room you just entered. Deal with them quickly.

Inside this hidden area, you'll find the Yellow Key. Grab it and you're good to go!