Overtime mode
Successfully complete all case missions up to The Facts. Then, talk to Isabela in Carlito's hideout before and after the 10 a.m. cutscene. Then, return to the helipad by 12:00 p.m. on the 22nd to unlock Overtime mode.

Infinite mode
Successfully complete Overtime mode to get the "true ending" and unlock Infinite mode.

Katana
Go up to the second floor, then go to Colombian Roastmasters. Go to the where the cash machine is located, then jump out onto the roof/ledge below. Land on the orange overhang, then look for the katana.

Shotgun
Get to the Entrance Plaza for the first time -- when the man tells you to look for barricades. Notice that one of the men talking near the entrance has a shotgun. When the zombies attack, run up to his body. It is in midst of a tightly packed zombie swarm. Pick up the shotgun and run upstairs. This weapon is very good for some of the first Bosses, like Convicts.

Submachine gun
Jump from the stairs closest to you when you start to the blue ledge above Kid's Choice Clothing. Keep following the walkway past the stuffed bear all the way to the end to find the submachine gun.

Uzi
In the Food Court, go to the sign with the Italian chef. Climb to its left side, then to the top to find an Uzi.

Easy zombie kills
Go to the parking garage in Leisure Park. Get in the car parked outside. Drive down into the parking garage and run over zombies by going left and following the tunnel until you get to another vehicle. When you reach it, switch vehicles and drive back out. The car will have respawned. Repeat this process until you have killed as many zombies as desired.

Perfect erotica picture in Photo Challenge
After doing the photojournalist tasks the first time, the man will tell you to come back at noon the next day. When you return the next day, you will see him fighting zombies in the Paradise Plaza. He will want to talk to you. When you talk to him, you will have to show him a "Perfect" erotica shot to get the next challenge from him. To get this shot, save Selphie, the girl that runs from the convicts the first time you see them. Go to the security room where she is at. She will be sitting down. Walk up to her to make her stand up and step back, then zoom in. Choose the moment when she is squatting back down so that you can see up her skirt and you will get a "Perfect" erotica shot. If she sits down totally, make her stand back up and repeat until you get the shot.

Fight convicts again
Use the following trick to fight the convicts in the park area again for more PP and a fully loaded machine gun. After killing the convicts, get into their car and do not touch the turret. Drive into the parking lot garage. Drive around for awhile, then drive out. Take the gun and leave. When you return to the park, you will see the trio riding around the park again. Kill them again and repeat as many times as desired.

Defeating Carlito
Find a Queen Wasp. Look for the zombies that are either holding their head or looking at there arms slightly above their heads. Then, get the katana from outside the first window on the back wall of the Colombian Roastmasters. Use the Wasp to kill most of the zombies. The best place to get them is to run for the middle. You might get shot once or twice, but if you have the queen ready this is less likely. He will hit you with a shot from the rifle. Run as fast as possible upstairs. Brad will get hurt a few times; just make sure he does not die. Run to Carlito and slice him with the katana. Be careful -- he tosses grenades as he is running and will hit you with the rifle after you hit him once. This also works with the hammer, but it is slow and he will hit you before you can hit him.

When fighting Carlito the second time with Brad in Entrance Plaza, it can be quite difficult. The best sniping position to kill him from is in the pink shop directly above the escalators where you first come in. There is a table with some signs on it. Position yourself between the little signs and shoot him with the rifle. Carlito may also turn his back to see where you are shooting him from.

Defeating the convicts easily
Get a sniper rifle from the gun shop before the owner appears and you must fight him. If you do not make it and you must fight him, the easiest way to take him out is to run back out of his store, kill the zombies outside, then shoot him with the handgun or Uzi. When you get the rifle, go to the park where the three prison convicts are found. There is a picnic area with benches just outside and to the right of Paradise Plaza. You can jump on top of this structure. This will keep you from having to worry about zombies jumping on your back while you scope the jeep from far away. The jeep usually seems to get stuck near the food court with its back to you. While on top of this structure, you can actually kill all three convicts with the rifle if you are positioned correctly. Once they are dead, just jump down to get access the .50 cal.

Bonus items
Successfully complete one of the following tasks to unlock the corresponding item inside a shopping bag behind the air duct in the Security Room:

Ammo Belt: Do not miss with a machine gun.
Arthur's Boxers: Survive for at least 7 days.
Hockey Mask: Photograph all PP Stickers.
Laser Sword: Survive for at least 5 days.
Mall Employee Uniform: Answer all calls from Otis.
Mega Man Boots: Get the true ending without being knocked out.
Mega Man Tights: Defeat at least 10 psychopaths.
Prisoner Garb: Steal the convicts' vehicle.
Pro Wrestling Boots: Break at least 100 items.
Pro Wrestling Briefs: Defeat at least 1,000 zombies barehanded.
Real Mega Buster: Defeat at least 53,594 zombies.
Special Forces Boots: Defeat at least 15 psychopaths.
Special Forces Uniform: Repel a helicopter.
White Hat: Photograph at least 50 survivors.
Unknown: Get at least 50 survivors out of the mall.

Alternate endings
Perform the indicated task(s) in 72 Hour mode to get the corresponding ending (from best to worst):

Ending A: Solve all cases and return to the helipad at 12:00 p.m. on the 22nd.
Ending B: Solve all cases and rescue a large number of survivors.
Ending C: Do not get to the helipad on time and solve all cases.
Ending D: Be a prisoner of the Special Forces at 12:00 p.m. on the 22nd.
Ending E: Do not get to the helipad or solve all cases.
Ending F: Fail to collect all of Carlito's bombs in Act 7-2.

Creating juices
Juices are created by mixing two of any food items in the blender upstairs at Columbian Roastmaster. All juices restore full health, but their effect only last a short amount of time. There are multiple ways to make juices:

Energizer (unknown effect) = Randomizer + Zombait
Nectar (attracts a Queen) = Orange Juice + Snacks
Quickness (move 5x faster) = Wine + Yogurt
Quickstep = Ice Pop + Yogurt
Randomizer (random effect or stomachache) = Cooking Oil + Snacks
Spitfire (spit becomes deadly) = Baguette + Snacks
Untouchable (invincible to any attack) = Baguette + Pie
Zombait (zombies more attracted to you) = Pie + Snacks

Achievements
Accomplish the indicated achievement to get Gamerscore points:

Zombie Hunter (20 points): Defeat at least 1,000 zombies.
Zombie Killer (20 points): Defeat at least 10,000 zombies.
Zombie Genocider (20 points): Defeat at least 53,594 zombies.
Self Defense (20 points): Defeat at least 1 psychopath.
Peace Keeper (20 points): Defeat at least 5 psychopaths.
Punisher (20 points): Defeat at least 10 psychopaths.
Legendary Soldier (20 points): Defeat at least 15 psychopaths.
Hella Copter (20 points): Repel a helicopter.
Tour Guide (20 points): Escort 8 survivors at once.
Frank the Pimp (20 points): Simultaneously escort 8 female survivors.
Full Set (20 points): Collect all portraits in the notebook.
Humanist (20 points): Get at least 10 survivors out of the mall.
Life Saver (20 points): Get at least 20 survivors out of the mall.
Saint (20 points): Get at least 50 survivors out of the mall.
Strike! (20 points): Send at least 10 zombies flying with bowling balls.
Costume Party (20 points): Place novelty masks on at least 10 zombies.
Raining Zombies (20 points): Knock at least 30 zombies aside with a parasol.
Gourmet (20 points): Eat all types of food available in the mall.
Item Smasher (20 points): Break at least 100 items.
Bullet Point (20 points): Fire at least 1,000 bullets.
Perfect Gunner (20 points): Don't miss with a machine gun.
Photojournalist (20 points): Score at least 1,500 PP from a single photo.
The Artiste (20 points): Score at least 3,000 PP from a single photo.
Group Photo (20 points): Get 50 Target Markers with the camera.
Portraiture (20 points): Photograph at least 10 survivors.
Census Taker (20 points): Photograph at least 50 survivors.
Psycho Photo (20 points): Photograph at least 4 psychopaths.
Psycho Collector (20 points): Photograph at least 10 psychopaths.
PP Collector (20 points): Photograph all PP Stickers.
Snuff Shot B: Photograph zombie Brad.
Snuff Shot J: Photograph zombie Jessie.
Transmissionary (20 points): Answer all calls from Otis.
Indoorsman (20 points): Spend at least 24 hours indoors.
Outdoorsman (20 points): Spend at least 24 hours outdoors.
Freefall (20 points): Drop from a height of at least 16 feet (5 meters).
Marathon Runner (20 points): Cover a distance of 26.2 miles (42.195 km).
Carjacker (20 points): Steal the convicts' vehicle.
Stunt Driver (20 points): Jump a car at least 33 feet (10 meters).
Stunt Rider (20 points): Jump a motorcycle at least 33 feet (10 meters).
Zombie Road (20 points): Walk over 33 feet (10 meters) on the backs of zombies using the Zombie Ride.
Karate Champ (20 points): Defeat at least 1,000 zombies barehanded.
Sharp Dresser (20 points): Change into at least 20 different costumes.
Clothes Horse (20 points): Change into all costumes available in the mall.
Level Max (20 points): Reach level 50.
Unbreakable (20 points): Get the true ending without being knocked out.
Overtime Mode (20 points): Unveil all cases and be at the heliport at noon.
8 Mode (20 points): Get the true ending.
3 Day Survivor (20 points): Survive for at least 72 hours.
5 Day Survivor (20 points): Survive for at least 5 days.
7 Day Survivor (20 points): Survive for at least 7 days.

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