Enter the underground tunnels through the stairway in the Americana Casino. Grab an orange cart, and go left (north) up the tunnel. As it curves, you will see a large jump with a blue tarp covering it. The gun is on the top of the tarp. Combine it with an Amplifier to get a very powerful gun.
Easy money
Use the following trick to earn $40,000 each time it is done. Go to Slot Ranch Casino in Sandbox mode. Kill enough zombies to unlock the challenge on the stage. Before you start the challenge, go behind the curtain and locate the flying saucer. Bring it with you and start the challenge. When the challenge starts, start the flying saucer. The zombies will be lured in to the saucer. When 25 zombies get close enough and remain there, you will win $40,000. After the challenge, pick up the saucer and repeat the process as many times as desired.
Easy PP
Photograph the side of TK's head in the "TK Needs Zombrex" mission for 500 PP each time. Repeat this as many times as desired.
On Day 2, do the "Here Comes The Groom" mission. Get the Psychopath's attention away from you by leaving the building and returning approximately 30 seconds to 1 minute later. When you return, he should have the bride in a chokehold and will not release her until you get close. You can repeatedly photograph this for 5,000 PP each time.
Magazine locations
Search the indicated location to find the corresponding magazine:
Bargaining 2 (lowers pawn shop items cost by 10%): In security box #145.
Gambling 1 (significantly increase your chances of winning money): In Palisades Mall, on a table above a pool bar, where you go down the slide.
Gambling 2 (significantly increase your chances of winning money): On a ledge on the left side of the top floor of Bennie Jack's BBQ Shack in the Americana Casino.
Gambling 2 (significantly increase your chances of winning money): In security box #304.
Other outfits
Complete the indicated task to unlock the corresponding outfit.
Champion's Jacket: Found inside the "Hostile Zone" at the Fortune City Arena.
Chuck Greene outfit: Have a saved game file from Dead Rising 2.
Dealer outfit: Search the managers office where you save Lenny Mooney in the Yucatan Casino.
Ninja hood: Search the secret sniper location at Royal Flush Plaza.
Tattered clothing: Earn the "Party Time" achievement or trophy.
Willamet Security outfit: Earn the "Maintaining The City" achievement or trophy.
Outfit locations
Search the indicated location to find the corresponding part. Note: All outfits have the same function as in Dead Rising 2. The Protoman outfit is a throwback to the original Dead Rising, except you have a shield as well as a cannon.
Soldier
Boots: In a box in the vacant store to the right of the Ultimate Playhouse at South Plaza.
Clothes: Earn the "Save the Girl... Again" achievement or trophy.
Facepaint: In Shank's in the Palisades Mall.
Nightvision Goggles: Purchased in the Platinum Strip Pawnshop.
Psychopath
Boots: In the security room in Fortune City Arena.
Clothes: Defeat Carl in mail order Zombrex mission.
Mask: In the Wedding Chapel on the Silver Strip.
Hair: Watch the Timeshare movie in Paradise Platinum Screens in the Platinum Strip, from 12 a.m. to 2 a.m.
Ninja
Boots: In the Man's Sport store in the Uranus Zone.
Clothes: Earn the "Elite Killer" achievement or trophy.
Hood: In a hidden room along the Ninja path in the Royal Flus.h
Mask: On the mannequin by the entrance to Shoal Nightclub.
Sports Fan
Cleats: In SporTrance in the Royal Flush Plaza.
Clothes: In KokoNutz Sports Town in Palisades Mall.
Facepaint: At the end of the Ninja path in the Americana Casino.
Helmet: In the back room of Hot Excitorama on the Silver Strip.
Proto Man
Helmet: Defeat Jack at strip poker in the Ante Up mission, or defeat him in Sandbox mode.
Armor: Earn the "Challenge Experience" achievement or trophy.
Boots: In the Ultimate Playhouse in the Palisades Mall.
Gun/Shield: Earn the "Save the Girl Yet Again" achievement or trophy.
Security box keys
Search the following locations to find the corresponding Uranus Zone Bank deposit box key.
001: Royal Flush Plaza, near doors to safe house ($50,000).
009: Atlantica Casino, security office ($25,000).
015: Unknown.
040: Palisades Mall, behind bar in lounge ($100,000).
044: Americana Casino, on the lights on the way to Dead Rising 2 Zombrex location ($100).
045: Palisades Mall, on top on the slot machines between Wallington's and the Venus Touch ($50,000 and handgun).
052: Arena, behind a table near backstage entrance ($100,000).
083: Americana Casino, cashier office (gems).
097: Arena, security room ($100,000).
112: Palisades Mall, Trendy Cindy, behind counter (three remote mines).
145: Royal Flush Plaza, Tunemaker's maintenance room (Bargaining 2).
185: Fortune Park, entrance to Uranus Zone, under right escape pod ($10,000).
203: Royal Flush Plaza, on the second floor, jump on the phone booth and follow the secret route. Go the other way before jumping on the platform with the flowers then jump to another platform with the key ($50,000).
304: Fortune Park, ledge to right of entrance to hotel (Gambling 3).
329: Unknown.
666: Royal Flush Plaza, Sturdy Package, behind counter ($50,000).
673: South Plaza, Hotel Lobby (Zombrex and gems).
690: Silver Strip, Hot Exictorama ($50,000 and massager).
764: Uranus Zone, The Venus Touch (six shooter).
999: Atlantica Casino, in front of Poseidon Statue ($25,000 and Zombrex).
Various Trophies
Complete the following tasks to unlock PlayStation 3 trophy rewards.
Trophy
How to unlock
Adult Content (Bronze)
Take an extremely erotic picture.
Alpha Vs. Omega (Gold)
Have Denyce attack and damage Sgt Boykin.
Award Winning Photography (Gold)
Photograph 75 PP stickers.
BFF (Bronze)
Use the Snapshot skill move on a zombie.
Best of Friends (Bronze)
Defeat 5 psychopaths in co-op.
Camera Crazy (Bronze)
Take a picture of a psychopath.
Card Archive (Bronze)
Collect 50 combo cards.
Card Collection (Bronze)
Collect 20 combo cards.
Challenge Addict (Bronze)
Get at least a bronze medal on 10 different single player challenges.
Challenge Domination (Silver)
Get a gold medal on all single player challenges.
Cramped Quarters (Bronze)
Get 8 survivors into a vehicle.
DR2:OTR Trophy Master (Platinum)
Acquire all the trophies in Dead Rising 2: Off The Record.
Dominoes (Bronze)
Use the Jump Kick to knock down 100 zombies.
Drugged Up (Bronze)
Take a dose of Zombrex.
Elite Killer (Bronze)
Kill 1337 zombies. [Host Only]
Even More Help From My Friends (Silver)
Get a gold medal on all co-op challenges.
Frank West: Cross Dresser (Bronze)
Dress up completely in women's clothing.
Full Camera (Bronze)
Fill your camera's memory.
Hands of Doom (Bronze)
Unlock all skill moves.
Help From My Friends (Bronze)
Get at least a bronze medal on 10 different co-op challenges.
I Got a Medal! (Bronze)
Get a medal on a challenge in Sandbox Mode.
Luggage Code (Bronze)
Kill 12,345 zombies. [Host Only]
Maintaining the City (Bronze)
Visit 10 different maintenance rooms.
Making Memories (Bronze)
Take a picture of your co-op partner during co-op play.
Mixed Messages (Bronze)
Take a picture with elements of horror, brutality, outtake and erotica in a single shot.
More Help From My Friends (Bronze)
Get at least a bronze medal on all co-op challenges.
New Hotness (Bronze)
Build one of the combo weapons new to Dead Rising 2: Off The Record.
Nice Shot (Bronze)
Photograph a PP sticker.
No Zombies in the Vents (Bronze)
Unlock the secret shortcut.
Out With the Old (Bronze)
Defeat the motorcycle-riding psychopath. [Story Mode Only]
Party Time (Bronze)
Get a survivor drunk.
Photo Album (Silver)
Photograph 25 PP stickers.
Photo Journalist (Bronze)
Get back in the game by gaining lots of PP from pictures.
Photo School (Bronze)
Take a high PP value picture.
Powered Up (Bronze)
Restore power to the Yucatan Casino.
Prestigious PP (Bronze)
Get over 2,000 PP from a single zombie kill.
Prom Night (Bronze)
Kill 69 zombies. [Host Only]
Puking Rally (Bronze)
Have a zombie slip in a puddle of vomit.
Purewal Memorial Cup (Bronze)
Don't consume any meat, dairy or alcohol until the military arrives.
Raw Emotion (Bronze)
Take a photo of a survivor in a very dramatic situation.
Safety Check: Failed (Bronze)
Use the amusement park rides to kill 10 zombies at once.
Save the Girl (Bronze)
Rescue a damsel in distress from the Twin Terrors.
Save the Girl... Again (Bronze)
Save the damsel in distress a second time.
Save the Girl... Yet Again (Bronze)
Save a damsel in distress for the third and final time.
Six Digits?!? (Gold)
Kill 100,000 zombies. [Host Only]
Team Player (Bronze)
Avert a mutiny.
Technological Terror (Bronze)
Destroy a 'harvester'.
The Challenge Experience (Bronze)
Get at least a bronze medal on all single player challenges.
Tiger Tamer (Bronze)
Have Snowflake attack and damage a psychopath.
True Colors (Bronze)
Defeat the mastermind of the Fortune City incident.
We Have a Winner! (Bronze)
Play a carney game and win.
Zombrex locations
Search the indicated locations to get free Zombrex.
Enter the second level of the VIP Lounge in Uranus Zone. Climb outside and go around the outer awning towards the Atlantica Casino.
Enter the underground tunnels. Go south and west from the eastern-most one and search the floor near the maintenance room.