Video below if you’re lost:įrom the front desk follow the green line on the wall, eventually you’ll reach the break room.

You can’t press the button immediately, you have to wait until the security guard has finished speaking. Interfere with the alarm and laptop in Anomalous Materials.Īfter the introductory train ride you’ll reach the front desk of the research facility, on your left as soon as you walk in is a computer you can interact with, after that walk behind the desk and press the button to the left of the scientist. You can find them a bit into the chapter, after doing the jumping puzzles, you’ll reach the orange crystals that lower your Suit Power/HP, just after these crystals there’s a cave across from you with a dead scientist in it, this is where you can find the hidden hat and pizza box, double jump across to the cave, in the back corner in a little hole you’ll find the hat and/or pizza. Once you reach Xen you’ll need to find the hidden hat and the pizza box again. You can find it on the bench in the cafeteria. Carry it all the way to the Nihilanth fight for the achievement. Similar to the Hidden Hat achievements, instead you’ll find the pizza box during Chapter 11: Questionable Ethics. Same as the achievement above, however once you’ve sent the hat through the teleporter to Xen you’ll need to continue carrying it to the Nihilanth fight. Once you have the hat you’ll need to painstakingly carry it from here to the end of Chapter 14: Lambda Core, and place it in the teleporter. You can find the Hidden Hat during Chapter 3: Unforseen Consequences, a little bit into the chapter you’ll return to the front desk area from the start of the game, instead of going through the vent to your right, go back out towards where you got off the train on your right are some pipes you can jump on, the hat is hidden in the corner.

Black mesa lambda core