- 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.
- Infinity mode
Successfully complete Overtime mode to get the "True Ending" and unlock Infinity mode. In Infinity mode, you lose 1 life bar per 100 real seconds. It requires 20 real minutes to lose all 12 life bars if you have them. This equals four game hours.
Go to the Paradise Plaza. Go to the second floor and find the Colombian Roastmasters in the food court. Look over the rail and you should see an orange platform. Jump on it and there should be a katana there. The katana is a one hit kill weapon and chops the limbs off the zombies. It is one of the most powerful weapons in the game.
After killing Adam the clown by the rollercoaster in Wonderland Plaza, he will drop a chainsaw. Pick it up before you activate the control to stop the ride. After the intermission sequence, another chainsaw will spawn at the location. Pick it up. Get the Criminal book from the back of the bookstore where you find the Japanese tourists, and the Engineering and Entertainment books from the Book Store accros from the toy store and CD store in Paradise Plaza. These will give you three duration enhancers for the mini-chainsaws that you get from the clown, which will make these powerful weapons last for a long time. These chainsaws can kill Bosses in two or three hits and are great crowd killers.
After killing Adam and getting the mini-chainsaws he uses, grab the Criminal Biology, Engineering, and Entertainment books to make them last nearly forever. They are the best weapon in the game.
- Molotov Cocktails
After the Boss fight where you fight Paul, he will be engulfed in flames. Do not kill him. Instead, pick up the fire extinguisher in the store to put out the fire. Then, bring Paul back to the security room. If done correctly, there may be two women as well. After a while, you will receive a call saying that Paul has a present for you. Go back to the security room to meet Paul. Continue to talk to him and he will give you an unlimited supply of Molotov Cocktails.
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.
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. Additionally, go to the Al Fresca plaza. Find the fountain near the entrance to the plaza, which will have about 200 zombies wandering in a circle. Jump into the center of the fountain to find a dumbbell, and next to it an Uzi.
- Trip attack
When you jump, press X when your feet are just off the ground. You should drop to the ground spinning your leg, tripping zombies. You will get 30 PP for each zombie you hit. This is very difficult to do while moving.
- Easy PP
While on the helicopter at the beginning, take a picture of the gas station as it explodes to get more PP. Also, take a picture of the women being tackled off the roof as she is in the air to get more PP points.
When you first come out of the vents to the rooftop at the beginning, turn left and go to the far end of the roof. A woman named Natalie will be standing there. Talk to her and make her follow you (kicking the soccer ball at her is also something you can try). Take her to the other side of the roof where the elevator is located, then go to the far end there. You will see a man named Jeff creeping around the dumpster. Immediately take out your camera. Quickly take a picture of the two of them hugging and kissing for 10,000 PP.
In any food area in the mall (for example, Jill's Sandwiches and the Colombian Roastmaster), pick up a frying pan and examine the stove. You will get 2,000 PP for using the stove. When the frying pan is red hot, you can use it to get another 100 PP for every zombie you kill by holding X and burning their face.
The microwaves can cook frozen and uncooked food products with a 2,000 PP bonus (similar to the frying pan). You only get the bonus once for each of the microwaves (six or seven in all), including a 10,000 PP bonus for getting them all. In addition, cooked foods provide more health, but eat it right away or it will spoil.
Enter the Chris' Fine Foods restaurant in the Food Court. Break the large dishes sitting on stands on the east wall for 1,000 PP each and a 10,000 PP bonus for destroying all of them.
In the toy shop, hit the giant servbot until the swirly eyes are lined up with the sad face for 10,000 pp.
Go into the gym across from the hardware store. Knock down the punching bags to get 2,000 PP per bag, and 10,000 PP after you knock down all the bags.
In the gym, run on the treadmills for 2,000 PP each. You will receive a speed boost and a 10,000 PP bonus for running on all the treadmills. The Gym is also a Safe room. Zombies cannot enter it unless you break the glass.
Repeatedly hit a clothes rack so that it spins to get a 2,000 PP bonus.
Get in the rollercoaster in Wonderland when it is not out of control. Ride on the roller coaster until it stops to get 10,000 PP.
Go to the plaza outside of the warehouse some time on the second day. You will see an intermission sequence showing someone about to murder a trapped girl in a box. After the scene the man is nowhere to be found, but there will be strange people in masks and yellow raincoats that will attack you if you get too close to them. They all have good knives. For every one of these psychopaths you kill, you will get 500 PP. If you see one of them throw up his arms and shout, he will have just lit a stick of dynamite. If you are low on health, run toward him. When he grabs you, shake him off then run. The blast should take out his friends. The best weapon to use against them is a handgun; try to aim for the head. Be careful when fighting them with a melee weapon. They will sometimes try to gas you for capture. If this happens, you are not dead but will lose all your weapons and must escape. After you are out of the box, go directly ahead. Grab the folding chair and walk slowly to the large group of worshippers to attract some of them. Try not to alert all of them at once, just about two or three. When that weapon breaks, start to use the jump kick on them. When you have cleared out a good number of them and you have an open path, run towards the carpet they are praying to. On the red carpet is a sword. It should take them out fairly quickly, allowing you to escape.
Kill a Spec Ops to get his machine gun. Go to Seon's Supermarket in Overtime mode. There should be over eight Spec Ops there. Enter the pharmacy and close the double doors leading to the corridor to the pharmacy. They will all stand in front of the door if they see you and not do anything. Go to the window in the front of the pharmacy and shoot them down with the machine gun. To repeat this, get new machine guns from the bodies and exit via the maintenance door in the corridor. Shoot any Spec Op from the front window to make them all crowd in front of the door again. You will get 1,500 PP per Spec Op. You must successfully complete Overtime mode though to keep the PP. Do this after giving Isabella nine Queens and having one in hand for when you decide to finish.
- 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.
- Unlimited zombie hallway
Go to the entrance plaza then go upstairs. Go to the end with the bee then go to the door marked "Exit". This hallway is the one from the very beginning that Otis sealed off. It is a dead end but has a lot of zombies that will continuously respawn. This allows you to get a lot of kills quickly. You can also stop by the antique store on the way and pick up a few katanas or battle axes for very fast kills.
- Healing survivors
If you are having trouble with survivors getting low on health and dying while you escort them back to the security room, carry enough health items for yourself and a survivor or two. Orange juice and coffee creamer work good because they heal fairly well, and nothing is needed to make them.
- Equipping survivors
When giving survivors weapons, try to give them blades such as katanas or cleavers. The mini-chainsaws Adam uses are also good, but remember to switch them for something else before going into the security room. Also, if you prefer guns, shotguns and a submachine gun are good except for the stray bullets that hit you. If you give them a gun, try to give survivors shotguns. They will kill the zombies around them and you. They help each other out and very little damage is done if they hit you or each other.
- Escorting survivors
When escorting survivors, use waypoints (go into aim mode and press Y) instead of having them follow you. This makes them go directly to the waypoint instead of walking around trying to get to you. This also gives you time to help any stragglers. Make sure to set the waypoint in a safe area and do not stray too far from it unless you absolutely have to.
- Paradise Plaza shortcut
After you defeat Adam the clown and stop the roller coaster, a Willamette employee will be on the ride. His name is Greg Simpson, and he will tell you he knows a shortcut back to Paradise Plaza. You will follow him into the women's restroom, where he will stand near the sink and say "Go right through here and you'll be in Paradise Plaza". It is difficult to understand what he is talking about. Jump up on the sink and an icon will appear that reads "Paradise Plaza". You now can simply leap back and forth from the women's restrooms in Paradise Plaza and Wonderland Plaza. Not only is this a useful shortcut, but it is also quite helpful in getting survivors back to the security room safely.
- Keeping clothes
If you die and choose to save and start a new game, you will be wearing whatever items of clothing you had when you saved. This means you could be naked except for your boxers, wearing children's clothing, etc.
- Getting back your regular outfit
If at anytime you change into an outfit you do not like, you can get back your default outfit in the janitor's room, underneath the stairs leading to the heliport.
- Perfect erotica picture in Photo Challenge
After you talk to Kent and do his mini-mission to take pictures of him, there will be an in intermission sequence where he shows you pictures he has taken and asks if you can do better. This will give you scoop information on the next challenge for him on the next day. For that event, you will need a perfect Erotica picture (saved from a previous game or during that same game; the game allows you to choose from your picture viewer). Save Selphie, the girl that is being chased by the convicts out in the park. When you have her safely back to the security room, she will be in the room beside the couch that you can save at. Go in the room to make her stand up. Stand away from her and zoom your camera in around her knees. She will start to sit down. Take a picture the moment you can see up her skirt for a "Perfect" erotica shot that can be used for Kent's challenge. This may require more than one attempt, as the timing must be precise.
Later in the game, after Brad is shot and becomes ill with a fever, you have a chance to take an erotica picture and not only score a perfect, but get a lot of points as well. As soon as Frank tells Jessica that he will find some medicine and you have control again, open the door that leads into the room with the vent. Step into the doorway, then turn around so that you are facing Brad and Jessica. At this point, you should see Brad laying down on the bed, and Jessica sitting on the edge of the bed looking at him. Take out your camera, zoom in, and try to focus the camera on her chest, or a little below it, then take the picture. If done correctly, you should get an erotica circle for both Jessie's chest, and the opening in her skirt below. Doing this can net a perfect score, as well as several thousand PP. You can save this picture to later show to Kent upon playing over again.
- No generator in Overtime mode
If you check the clock tower earlier in the game (where you see the intermission sequence showing the opening of the cave crammed with zombies), you will not have to get a spare generator for Isabela in Overtime mode, just ten Queens to stop Frank's zombification. If you wait until Overtime mode, at the point where you gather all the supplies for her, she will tell you that you must get the backup generator behind the clock tower before you can go after the Queens.
- Infinite ammunition for military jeep .50 cal
When you are in the park in the middle of the mall, there should be three convicts in a military style jeep. If not, they will show up later in the game. Try to kill them. The Uzi you find on the balcony inside the mall works best. Kill the gunner first. If you kill the driver, the passenger will start to drive instead. When the gunner shoots, just move to the left or right until he stops. He cannot hit you if done correctly. You only have a second or two before he shoots again. You must hit him with a couple bullets, then start running again. Some time may be required to kill him, but it is worth it. After the gunner is dead, you can take the gun off the vehicle. After you have it, kill the other two convicts in the vehicle. You will get the jeep, an achievement, and a .50 cal. Shoot as many zombies as you can with the bullets you have. After your raid, get in the jeep. You will drop the gun. Look at where the gun was before you took it off. There is an empty slot there. When in the park, follow the perimeter. There is a road that you can turn into to go to a small parking lot. Go to the parking lot. There should be a motorcycle and a red car here. Inside the lot, there is a road that goes down into the basement parking lot. Go down with the jeep. There are a lot of zombies down there. This is a good location to get the Group Photo achievement. When you are done loading the level, look at your gunner slot. A gun should now be there. Drive around a little until you get to a location where you can get out take off the gun. Do not drive far, as you may get lost. Shoot everything until your ammunition is gone. Get back into the jeep. Once again there will be no gun in the slot. Leave by the same way you came in. You can stay down there, but do not just run over victims because there are some zombies with oxygen tanks that will explode when run over. Enough of these will render your car useless and prevent the gun from appearing again. When you get out of the underground lot and load the level again, look at the gun slot. Another gun will be there. Keep going down and up, loading another part of the level to spawn another gun. You can keep doing this for easy kills and an easy shooting 1,000 rounds of ammo achievement.
- 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.
To easily defeat Carlito the second time when he has a sniper rifle, begin by running up the stairs. As soon as you get up, turn left. Keep moving to avoid his shots. Try to stay out of his sight. At the "corner" on the second level near Carlito is a sporting goods store. Go inside and grab a hockey stick or two. Leave the store and quickly run across to the pillar. Stand almost even with the pillar so that Carlito cannot see you at all, but will keep shooting at you, only to hit the pillar. Hold RT to aim with the hockey stick. The end of the stick (and therefore the puck) should be sticking out past the pillar while your body is still fully protected behind the pillar. If not, reposition yourself until you can shoot pucks at him. Once set, start slapping away until he "dies" and the intermission sequence starts. Be careful not to also hit Brad.
The third time you fight Carlito is when collecting the bombs in Case 7-2. To kill him easily, unlock the Real Mega Buster and shoot him about three times when he appears. Additionally, if you want to have a safer trip during the mission, instead of entering the tunnels through the parking lot with the motorcycle, get the maintenance key before the case and enter through Paradise Plaza. There will be a white sedan that will not break down as easily as the motorcycle.
- 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 or 10 special forces soldiers. 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 (unknown number). 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
Certain books will give a specific effect:
Weekly Photo Magazine: Skill+ (get a visual cue to indicate prime photo timing) Sports: Item+ (hold onto sporting goods three times as long as usual) Camera 1: PP+ (get a 25% boost to PP resulting from photos) Hobby: Item+ (hold onto toys three times as long as usual) Engineering: Item+ (hold onto tools and construction related items three times as long as usual) Horror Novel 2: PP+ (get a 25% boost to PP resulting from defeating zombies) Entertainment: Item+ (hold onto entertainment related goods three times as long as usual) Interior Designing: Item+ (hold onto interior designing goods three times as long as usual)
- Easy Bullet Point achievement
Kill Spec Ops and empty enough of their machine guns to get the achievement. You could also go to Al Fresca Plaza via the Entrance Plaza, get the submachine gun in the fountain, empty it, then go back to the Entrance Plaza and repeat until you get it.
- Easy Carjacker achievement
Unlock the Real Mega Buster, then shoot all three convicts once in this order: gunner, driver, passenger. Get in the car and you will get the achievement. Alternately, get the submachine gun in the Al Fresca Plaza Fountain and wait until the convicts crash into a tree. Shoot the gunner with the submachine gun until he dies. Take the gun he was using from the back of the car and use it to kill the driver and passenger. You may want to do all this during daytime and/or after you escorted Sophie or any survivors with you.
- Easy Costume Party achievement
If you do not have ten or more item slots yet, go to Ye Olde Toybox in Paradise Plaza and grab a few novelty masks. Take them to Child's Play and drop them on the floor next to the Servbot Masks there until you have ten. Then, just put them on zombies until you get the achievement.
- Easy Punisher achievement
Unlock the Real Mega Buster, then use the Buster on all the psychos. They should be dead from one to five shots. If not, use the mini-chainsaws Adam the Clown drops.
- Easy Unbreakable achievement
Unlock the Real Mega Buster, two bottles of wine, have at least one mini-chainsaw, the Criminal Biology, Engineering, and Entertainment books, and reach Level 50. You will be able to kill anything with one or two hits. Note: To get the Unbreakable achievement you only need to play Overtime mode and not get caught by the Spec Ops (i.e. do not lose all your health). If you started playing from 72 Hours mode, being captured by the Cult Members also affects this achievement.
- Easy Hella Copter achievement
Unlock the Real Mega Buster and use Zombie Ride to get on a zombie's shoulders. Jump on top of one of those cement shack objects over the benches. Time your shots so that they hit. They slightly slow. Try to wait until it stops. It should break down and leave in just a few hits.
- Easy Legendary Soldier achievement
Unlock the Real Mega Buster and go to Seon's Supermarket. There should be around eight or more Spec Ops there. Make your way into the pharmacy if desired, but close the double doors you open to get to the corridor leading to it. They will just stand there. You can shoot at them from the pharmacy without them shooting at you. You do not need to do this since the Real Mega Buster kills them in one or two hits. However, use this tactic with one of their machine guns if you do not have the Buster yet.
- Easy The Artiste achievement
When you reunite the first couple of survivors in the rooftop, snap a picture as they hug for a large amount of PP. They should have a golden PP marker over their heads when the time is correct. Many other survivors and psychos have other golden marker poses that give large amounts of PP. Two easy ones are taking a picture of the two people hanging from a huge toy or something in Wonderplaza during Day 2.
- Easy Strike! achievement
Grab a bowling ball and go to the Maintenance Tunnels. Throw the ball and you will likely hit ten or more zombies. This may also work in Al Fresca Plaza.
- Easy Raining Zombies achievement
Get a parasol and go to Al Fresca Plaza. Use it and you should get it easily.
- Easy Zombie Genocider achievement
Go to the parking lot in Leisure Park and get in the convertible. Drive into the maintenance tunnels and grab the maintenance key in the "T" shaped dead end just ahead of where you went in. Get back in the car and drive over to the exit under Paradise Plaza. Switch to a white sedan there then drive all the way over to the exit under Seon's Supermarket. Kill as many zombies in that location as desired. Then, switch to the delivery truck there and drive once more around the maintenance tunnels until you reach the exit to the parking lot. Drive out and switch to the convertible and repeat everything except the maintenance key part. Try to choose an efficient route and stick to it. It will take a while but you will be able to get it if you begin doing it at the start of 72 Hours mode. It would be a good idea to stock up on wine or orange juice, have at least one nice melee weapon and the two Horror Novels to get the most out of the PP you earn from killing the zombies.
- Easy Karate Champ achievement
Get to Level 50 and have all slots full of wine or orange juice except two. Kill zombies with skills such as Double Lariat or Giant Swing. Also, when you can fight Cliff, kill him and get the Wrestling Book from the empty store next to Crislip's Home Saloon.
- Easy Group Photo achievement
Go to the maintenance tunnels and take a picture of the huge crowds of zombies. You can also try this in Al Fresca Plaza, Wonderland Plaza when the two survivors are dangling from the huge toy object, or in the cave near the end of the game.
- Easy Zombie Road achievement
When you get the skill "Zombie Ride", go down to the maintenance tunnels. Go to one of the huge crowds of zombies and use the skill to get on top of one. Make sure to release A when you get on top. Walk on them in a circle and you will get it easily. Try practicing the skill first and have some wine or other food with you just in case. A Queen might also be useful for an emergency.
- Easy Outdoorsman achievement
After getting the "Zombie Ride" skill, go out to Leisure Park and go to the area near North Plaza. Get on top of a zombie and jump off it to get on top of the cement cabin structures on top of the benches. Just stand there until you get the achievement. Standing on the helipad may also work.
- Easy Indoorsman achievement
Find a store where you can close the doors, such as Ripper's Blades in the Entrance Plaza or an empty store in North Plaza. Stand there until you get the achievement. Bathrooms are also good, especially the one in Paradise Plaza. The Security Room may also work.
- Easy Freefall achievement
Go up the stairs in any two floor plaza and jump down to the first floor.