General assumptions: Penthouse is large, two-level location, which should be carefully explored in order to plan how to get rid of Layla. The safest way to move around is to disguise as Blackwater tactical team member, because in case of using Blackwater bodyguard disguise, you would have to use Instinct often to hide your identity.
The main room on the ground floor (screen above) is permanently guarded by about three people even on the lower difficulty levels, but you have to watch out more for enemies patrolling the penthouse, because they can appear here unexpectedly, making it difficult for you to remain hidden.
Another of easier accessible rooms on the ground floor is the one with the elevator with murdered sushi delivery boy (screen above). In this case enemies are focused at one place, so you can easily sneak past them (I recommend jumping between pillars). Pay attention to the locked door. It requires a keycard (from Lenny's bedroom or from the office with the laptop - more information can be found below), but the rooms behind it can be accessed from the other side. You can also wait until one of guard unlocks it and quickly walk behind him.
Two rooms described above are connected with a narrow tunnel and outer balconies shown on the above screen. You should use these balconies, but watch out for enemies patrolling them (two or three). Be careful also near penthouse shutters because guards inside like standing close to them.
Another way to move between rooms mentioned at the beginning is using the upper inner balconies inside the penthouse (screen above). Unfortunately this is very risky, because even on lower difficulty setting these are patrolled by many enemies.
On the penthouse floor you'll find two places connected to different ways of eliminating Layla. Lenny's bedroom (screen 1) is the only room you can't access, even when using Blackwater tactical team disguise. So it would be good to eliminate enemies guarding the entrance or distract them. Inside the Lenny's bedroom you can find a sniper rifle and a keycard among other things. Another room on this floor is a trophy chamber (screen 2) - watch out here for laser traps.
Get back to the ground floor. Harder accessible room can be reached by unlocking the door in the room with the lift or by passing through the one of two passages shown on above screens. Both passages are located left from the place, where you started exploration of the penthouse, near the stairs.
In the room with a huge whale skeleton (screen above), you'll encounter a large group of enemies, but you might look around. You'll find here many weapons and evidence left on one of the couches.
In the office room, adjacent to the one described above, you should encounter only two still opponents, so you can explore it without problems. At one of laptops you can find another keycard.
Other rooms are not relevant in getting to know the penthouse. These are namely a room with a fireplace and area with Layla's panic room (screen above). Taking this opportunity you can also explore a second set of upper balconies, but you won't find there anything interesting except levers helpful in arranging accidents (more on that later in the walkthrough).
So much for exploration, let's get to the practice, which is choosing the way of eliminating Layla Stockton. Suggested ways of behavior are listed in three consecutive subsections of this guide:
- Penthouse - Eliminating Layla in traditional way - In this subchapter you'll find information on how to eliminate Dexter's collaborator in the usual way, i.e. with melee weapons, firearms and explosives.
- Penthouse - Getting rid of Layla in an arranged accident - In this subchapter you'll find information on how to eliminate Layla using the elements of the environment.
- Penthouse - Defeating Layla in a melee fight - In this subchapter you'll find information on how to eliminate Layla in a duel in her panic room.