RobCo Battlezone (6 Star Cores)
Once you enter the building, head straight and keep to your left as you pass the sign saying “RobCo Battlezone.” You’ll find yourself in a large area, but look to your left and find a staircase right next to you once you enter – it will have a red “Employees Only” sign next to it. There will be two Cores in the room at the top of the stairs.
Go back down the steps and keep to your left. There’s an entrance to the left of the large cage, enter and go straight when you see the fork. You’ll see two more Cores directly ahead of you.
Go back the way you came and this time take the left path at the fork. Down the stairs is a red computer. You’ll find a Core inside of it.
Go back out and and head to the passage between the stairs to your left. You’ll find the last Core behind the counter just inside.