Chapter Two: A Criminal Mastermind
Explore to the right and find a couple bottles of painkillers next to some corpses. Ascend the staircase to the next floor. You'll discover a trio of enemies up here--one carries an Ingram. Utilize bullet time and shoot-dodge behind the crates as protection. Be sure to pick up the second Ingram so now you can wield dual Ingrams. Walk beyond the guards and search the room on the right. Use the phone to listen to the line. Search the cabinets on the left for some painkillers. Use the microphone and kill the guard that enters.
Ascend the next flight of stairs and watch the cutscene introducing Mike the Cowboy. Grab the ammunition scattered around the room and ascend the next flight of stairs. Watch the television if you wish (Mike the Cowboy seems to enjoy it). Locate a group of enemies around the corner in the room on the left. Mike will assist. Enable bullet time and head inside. Duck behind the cover on the right if needed. Grab the plentiful ammo from the room as well as the painkillers to mend any wounds.
Round the corner and the door ahead of you closes. Mike suggests taking the stairs. Head up. A gang of foes waits beyond the top door. Mike is fragile, so try to keep him alive. You can attempt to lure the enemies out of the door. Once inside, you can go down the right or left. A cabinet filled with painkillers can be found down to the left. Enter the door on the left and you're at the top of a large staircase; several enemies shoot at you from the bottom. Utilize your grenades (more can be found on the staircase). Watch your step in these areas as even a small fall can cause damage.
Collect all the discarded ammunition. Locate the unlocked door near the bottom of the stairs and go through. Find a group of enemies on the right. Blast the items on the shelf for additional explosive damage. There's plenty of cover in the room. Utilize bullet time and take out the enemies. Search the cabinet on the far side for ammo and painkillers.
Find the wooden door on the side of the room; the room contains more enemies. Activate bullet time and kill the enemy just beyond the door and another under the scaffolding to the right. Seek out two more guards on the ground level to the left. Gather the ammo (return to the previous room and grab any ammo you couldn't carry before). Descend the scaffolding and cross the room to the double wooden doors. Don't neglect to pick up any discarded weapons and ammo!
Next room: get the guys on the ground, one ahead, one left, and one right. Wait for enemies on the upper floor to expose themselves and blast them. Accurate desert eagle shots work well. Stand behind the wooden boxes to the right of where you terminate the last enemy on the bottom. From there you can shoot foes that drop down onto the boxes and have a clean shot at the gas canister on the upper level. Shoot it when enemies walk near it. Clear all the rooms of enemies to watch the cut scene where you meet Vinnie and Vlad.
Three enemies emerge from across the room. Activate bullet time and eliminate them. Gather the ammunition and enter the door from where they emerged. Walk down to the window to complete the chapter.
Chapter Three: The Depths of My Brain
Go to the front door. Someone's knocking and has slipped a note under the door. Exit and head left down the hallway. Take a left at the intersection. Descend the long staircase to the door at the bottom. Approach the door ajar on the cold storage then walk up to Mona; she's sitting on the hospital table. The phone behind her is ringing; walk up to the phone and answer it. Face the firing squad and wait for the cutscene. In the interrogation room, pick up the pistol and shoot both of the detectives to complete the chapter.