From the start of the level, head straight and then to the left and proceed through the door ahead. Scan the vase to find some Machine Gun ammo and pick up the Handgun ammo next to it. Scan the lamp opposite the vase to find a Grenade. Grab the Ship Interior Map while you’re there. Now that you’ve looted the area, get into the elevator and go down. Exit the elevator and head through the double doors at the end of the hallway. Enemies will begin to spawn and attack. There is an infinite supply of them here, so don’t bother with fighting back. You can grab some Handgun ammo and several Grenades, but then get out.
After going through the door, follow the path to the opera house. Run past the stairs on the right to find a Green Herb. Proceed through the doors to the casino area to gather supplies before walking up to the shaking door. You probably know what to expect here. Sure enough, two enemies just like the Communications Officer boss will burst from the door and attack. Use a similar strategy here as you did to defeat the Comms Officer boss. Keep your distance and continuously shoot their weak, exposed heads protruding from their shoulders. If you have any B.O.W Decoys, use them here. Same goes for Grenades.
One of the enemies will drop the Trident Key upon its death. Go into the room that they emerged from to collect a Green Herb and a Grenade. Use the Trident Key to open up the locked door and follow the path behind it. Kill the enemy in this room and collect some Handgun ammo before proceeding. You’ll see a strange substance on the floor. Scan it to reveal a Grenade. A group of enemies will pop out and you must defeat them all. Scan the shelf for another Grenade and climb the ladder. Jump down at the end of the walkway to reach a lift. Take it down.
Head left once you’re off of the lift, proceeding through the door and down the ladder on the other side. Follow the linear path as it leads you upstairs and into another room. There will be a group of Handgun bullets and Grenades in here. On the other side of the door you will be faced with several more enemies. Dispose of them to continue. The next room contains a lot of ammo and a Green Herb. Kill the enemies outside and move through the next two doors. Proceed to the left. You will be faced with another group of enemies. Either kill them or run past, through the next door. A cutscene will trigger and the first half of Cat and Mouse will be completed.
