Dead Rising
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.
Small chainsaws- 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. After killing Adam and getting the small 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. Use the following trick to get unlimited small chainsaws. After you defeat Adam the clown in Wonderland Plaza, you can get a small chainsaw. Then, press the button to stop the roller coaster and another small chainsaw will appear. You can take the survivor back to the security room to earn some PP if desired. Go back to Wonderland Plaza. Go to the location where you got the small chainsaws. There will be another one there.
Katana- 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.
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.
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.
Sub-machine 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 sub-machine gun.
Uzi- When you exit the warehouse at the start of the game, go up the closest set of stairs on your right. When you are at the level part of the stairs, jump onto the blue ledge beside you. Once you have jumped onto the ledge, walk against the wall while still going forward. There will be a teddy bear, a bottle of orange juice, and a box. Walk even further to find an Uzi by itself on the next ledge. Go to the food court and look to the left (if entering from Leisure Park). You will see a big statue of a chef above a sign. Jump onto the place where the waiter would usually stand at a restaurant, then jump onto the ledge beside the chef. If you look closely, you can see an Uzi beside the chef. Go to the parking lot leading to the underground parking garage. Get into the sports car and drive to the part in the tunnel where there is a dead end that makes a "T" formation. Go through the door at the very end of the "T". Walk to the left and look behind a few barrels to find an Uzi. The maintenance key is also in this room.
Easy guns early- To get the shotgun and sniper rife, you must defeat Cletus, the owner of the gun store. If you go there before you finish the first mission where you help Brad, you do not have to fight the store owner. You can get as many shotguns and sniper rifles as desired to assist you during the first few missions. These weapons are very powerful and useful. Note: This also works on the third day.
Recommended weapon combo- Have the Mega Blaster unlocked, Adam's small chainsaws, the three books to enhance his chainsaws, and the rest however desired. Just by using the Mega Blaster and the chainsaws, you can last a long time without picking up different weapons. When they run out, just pick up the chainsaws at the rollercoaster in Wonderland Plaza and the Mega Blaster will be in the security room if you drop it or it runs out of ammunition.
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- Start the game and take five pictures of the man fighting the zombies on the car, then take five pictures of the zombies attacking the bus. Then, take five pictures of the gas station blowing up. Next, take five pictures of the girl on the roof, making sure you get her shooting one of the zombies, when she falls off, and one of her on the ground. When you get in the mall for the first time, take pictures of all the people. When you get to the roof, find Jeff on the right side. Then, find his wife on the other side and get a good picture of them hugging for a lot of points. Take them back to the security room. If done correctly, you should be at level 2. Get out into the mall and get killed, save your status, and quit. Do this 25 times and you will be at level 50 at the beginning of the game. This is very helpful because you will have all you skills up and all other things maxed out.
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.
Avoiding zombies- When walking in groups of zombies that you know are going to grab you, start jumping. This allows you to go to the area that you wish to travel to without being grabbed by a zombie. Zombies cannot grab you while you are in the air.