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. To get a bonus level in Decay,
get one A in every section. The final level will then become
available.
Invincibility:- Press Left, Square, Up, Triangle, Right, Circle,
Down, X at the cheat screen.
Unlimited ammunition:- Press Down, X, Left, Circle, Down, X, Left,
Circle at the cheat screen.
Slow motion mode:- Press Right, Square, Up, Triangle, Right, Square,
Up, Triangle at the cheat screen.
Invisibility:- Press Left, Square, Right, Circle, Left, Square,
Right, Circle at the cheat screen.
Alien mode:- Press Up, Triangle, Up, Triangle, Up, Triangle, Up,
Triangle at the cheat screen.
Xen gravity:- Press Up, Triangle, Down, X, Up, Triangle, Down, X at
the cheat screen.
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.
Starting tips:
After the "accident", you will discover a scientist giving CPR to a
security guard. Wait 15 to 20 seconds to see the outcome, which
usually results in the security guard being revived. He is not useful
at this time, but return to him after getting the crowbar. Kill him
with the crowbar so he can not fire back to get his gun and
ammunition.
Soon after this, you will ride an elevator upward. Have the gun ready.
Shoot the monster attacking the security guard; a couple of shots
should do it. This security guard can cover you until you reach the
main entrance area.
One important tactic in the early game is to use your "allies" to your
advantage. When you no longer require the services of a security
guard, kill him and take his ammunition. A scientist is also useful in
drawing enemy attack. Be careful not to harm an ally when another
security guard is present, as he will attack you. Also be aware that
monsters can sense your allies; and even if you crawl, monsters can
hear your allies' walk.
The beginning of the game also has the following glitch. There is a
scientist sitting in front of a damaged instrument panel, in the area
of the first scientist who opened a door for you. This scientist is
invincible. You can shoot or beat him with a crowbar, and all he will
do is whine. This also saturates the area with a large amount of
blood.
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
Extra health - Buy a soda from the random soda machines.
If you are impatient, shoot the soda machine.
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 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.
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.
Gameshark Codes
(M) Must Be On EC8783A81431D934
Unlock Alien Mode Cheat 4CA573BA1456F025
Unlock Infinite Ammo Cheat 4CA573721456F025
Unlock Invincibility Cheat 4CA5735A1456F025
Unlock Invisibility Cheat 4CA5738A1456F025
Unlock Slow Motion Cheat 4CA573A21456F025
Unlock Xen Gravity Cheat 4CA573421456F025
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