This guide will be showing you where to find the hidden Chip to get the GoldFish Brain achievement called “Chip”.
Finding the keycard
There is a fake wall just beyond the item found on the bottom right most point of the B1 area. Running against it and swinging your crowbar should make it go away. (Here’s a game tip, fake blocks change lighting when you get near, unlike real blocks, so this helps identify them.)
In the unlocked room you’ll find ANOTHER fake wall, this time hiding an Unknown Keycard.
Finding the Chip room
However, where is the door that it unlocks? Well, that is behind a secret wall found ALL THE WAY at the start of the game. Yes, go back to the first area (where you learn movement) and there is a hidden wall to the left. A gate there will unlock if you have the keycard.
Now go through the door, grab the Chip and pet the cat!