Invincibility
Go to the cheat menu and press Left, Square, Up, Triangle, Right, Circle,
Down, X.
Endless ammunition
Go to the cheat menu and press Down, X, Left, Circle, Down, X, Left, Circle.
Invisibility
Go to the cheat menu and press Left, Square, Right, Circle, Left, Square,
Right, Circle.
Alien Mode
Go to the cheat menu and press Up, Triangle, Up, Triangle, Up, Triangle, Up,
Triangle.
More Gravity
Go to the cheat menu and press Up, Triangle, Down, X, Up, Triangle, Down, X.
Slow motion
If you look at the credits, (all the way to the bottom) You'll see the code:
right, square, up, triangle, right, square, up, triangle
Bonus levels
Press Triangle, Square, Left, Right, Circle, X, Up, Down at the cheat
screen. Choose the "Extras" at the options screen to load new levels found from
other discs, such as the Official US PlayStation. Magazine Issue 57 (June 2002) demo
disc. To get a bonus level in Decay, get one A in every section. The final level
will then become available.
Extra health
Buy a soda from the random soda machines. If you are impatient, shoot the
soda machine.
All Decay missions
To enter the code you must have two controllers.
p2_R3, p1_L3, p1_up, p1_up, p2_down, p2_down, p1_left, p1_right, p2_left, p2_right, p1_X, p1_O, START
Defeating Gonarch
The Long Jump module can be used for more than moving between floating
platforms. You can get extra height when you jump into a wall or other object.
When you first get dumped in Gonarch's lair, to your right you may see white
"plants" coming out of the ground. You can use these as stepping stones to get
up on the raised area in the middle. This may not easy, but if you get up there
Gonarch will have trouble hitting you with any attacks. It is best to use
weapons like the crossbow for this part. You can also use the long jump
technique to get to other places you are not supposed to, and it is useful for
getting past annoying opponents quickly.
Saving ammunition
Do not waste precious pistol ammo on headcrabs. Use your crowbar, as it is
more useful.
Using the pistol
Use the following trick to save ammo for all guns other than pistol. Most
creatures or persons can be killed with five or less direct shots of the pistol.
Crabs: 2 shots or 1 crowbar hit
Zombies: 4 shots
Electric Aliens: 3 shots
Trip Bomb: 1 shot
Machinegun on stand: 5 shots
Soldiers: 5 shots
Dogs: 3 shots
Spitters: 4 shots
Using guards
If you have a guard, get him close enough and he will take care of almost
anything for you. The only time you ever need to fire is if the creature is
close to the guard.
Barney gets cut in half
When you enter the room where the lasers are shooting out the walls, run
through. There should be a Barney (security officer) on the floor. Watch
carefully and you can see the laser go across and literally cut him in half.
Man in blue
Enable the "Alien mode" code and start a new game. Go through the hall past
the main security room and go straight instead of right. A short way down that
hall is the man wearing the blue suit. Use your electric attack to break the
window and jump in. If you try to attack the man with the blue suit, it will not
work.
Dead guard talks
After the experiment goes awry, go get the crowbar and come back to the
place where the scientist is performing CPR on the dead guard. If you smack the
guard with your crowbar, he will talk.
Approach a guard or scientist that tells you information about something. Use a
gun that will kill them in one shot, such as the caliber pistol or the crossbow.
Shoot them just as you approach them, immediately before they start talking. If
done correctly, the guard or scientist will fall to the ground dead, but will
still tell you what they originally intended to say.
Look through dead scientist's eyes
When you walk around, you will at some point encounter dead scientists,
sitting with their back towards a wall. Crouch and then crawl toward the dead
scientist. You will glide through him. Continue to walk until you reach the
wall, then turn around. You can now see the way the developers have made the
skins for eyes and mouth and everything else. You can actually look through the
scientist eyes.!
Partial invincibility
When in decay mode and are playing both people, the second person is not
invincible, even if you enable the "Invincibility" code.
Glitch on the last level (endgame)
Do the all weapons cheat and god. put a satchel charge in the train
and blow it up. the man will not die because he is invincible (if u did not have
god on u will die) Space: on the end game do a cheat that allows you to travel
anywhere go out the back of the train and keep going for about 5 minutes you will
be back on ZEN.
Submitted by sambnurchill2
