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Metroid (NES) Cheats
100%
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Enter Kraid with no suit and only short beam
Added on 2007-05-04 at 16:08:02
000000 000024
000000 000024
This cheat is not at all helpfull it has practicly no point. Warning this mission is suicidal!
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100%
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Start game with no suit
Added on 2007-05-04 at 16:00:37
000000 000020
000000 000020
This cheat is fun to use because you look different, also if you use this cheat it will not effect game play.


By: JUSTIN BAILEY
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99%
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start with invincibility,infinite missles/,and all items
Added on 2004-04-27 at 22:25:06
When entering the password, write NARPAS SWORD0 000000 000000. You will have all items including ice beam.
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99%
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Screw attack without a flip
Added on 2007-07-28 at 18:52:41
press up+left or up+right and then jump at the same time pressing those buttons
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98%
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Build Your Own Cheat
Added on 2004-02-21 at 21:22:04
The code is 24 letters long, a letter uses 6 bits (there are 64 different letters). 24 times 6 is 144 bits (18 bytes). The last 2 letters are cryptators. So, we got a maximum of 132 bits to store information in. What is there to store then? Let´s have a look at that...
Map : 19 doors
Map : 5 zeebetites protecting the mother
Map : 8 energy tanks
Map : 21 missile tanks
07 : Is the Maru mari available?
02 : Is the Bomb available?
12 : Is the Varia available?
1F : Are the High jump boots available?
1D : Is the Screw attack available?
79 : Killed Kraid?
7B : Killed Ridley?
78 : Kraid statue activated?
7A : Ridley statue activated?

40 : Play as Samus without armour?

44-47 : Your start location

48 : Ice beam equipped?
49 : Wave beam equipped?
4A : Varia equipped?
4B : Maru mari equipped?
4C : Screw attack equipped?
4D : longshot equipped?
4E : High jump boots equipped?
4F : Bombs equipped?
48+49 : Wierd ice beam? (set both to 1)

50-57 : Number of missiles in possession, one byte
58-67 : Time elapsed, two bytes (word)

84-87 : Code rotation.
88-8F : Control bits to ensure that code is valid.

7C-83 : If you set all these bits the entire code
is reset and bits 0C-0F are set. Wierd.

These are spare bits that may hold various
secrets like the missing Mother brain etc.
38-3D : ?
41-43 : ?
68-77 : ?
You wonder what the hex stuff in front of the lines are? It´s my way of telling you where in the code the information is stored, much like an adress. Take a look at the table below and you might understand. "Map" means you have to consult my map to get the adress of each individual object. For example, if you set bit 05 to 1 the red door to the longshot treasure is open. If you set the bit to 0 the door is closed. As simple as that.
CODE TABLE -144 bits long

00,01,02,03,04,05 06,07,08,09,0A,0B 0C,0D,0E,0F,10,11

12,13,14,15,16,17 18,19,1A,1B,1C,1D 1E,1F,20,21,22,23

24,25,26,27,28,29 2A,2B,2C,2D,2E,2F 30,31,32,33,34,35

36,37,38,39,3A,3B 3C,3D,3E,3F,40,41 42,43,44,45,46,47

48,49,4A,4B,4C,4D 4E,4F,50,51,52,53 54,55,56,57,58,59

5A,5B,5C,5D,5E,5F 60,61,62,63,64,65 66,67,68,69,6A,6B

6C,6D,6E,6F,70,71 72,73,74,75,76,77 78,79,7A,7B,7C,7D

7E,7F,80,81,82,83 84,85,86,87,88,89 8A,8B,8C,8D,8E,8F
Deciding start location
These are the binary codes that decide your start location. Enter them at the adress 44-47. Note that if you enter an invalid combination the game will reset to the title screen or crash.
0000 -Brinstar
0010 -Hideout 1
0001 -Norfair
0100 -Hideout 2
0011 -Tourian
1110 -Example of an invalid combination
The adress 50-57 stores the number of missiles carried by Samus. Samus may have up to 255 missiles. How do we store the number 81 using 8 bits (one byte)?
Adr 50 51 52 53 54 55 56 57
Value 128 64 32 16 8 4 2 1
Bit 0 1 0 1 0 0 0 1
That´s how. 81=64+16+1. So, this is how 81 looks like in binary: 01010001
Note that Samus got to have enough missile tanks to carry that amount of missiles
The amount of time elapsed is stored in a word (ie. 2 bytes). The byte to the left is worth less than the one to the right. This is how we store the number 16752 using a word.
Left byte:
Adr 58 59 5A 5B 5C 5D 5E 5F
Value 128 64 32 16 8 4 2 1
Bit 0 1 1 1 0 0 0 0

Right byte:
Adr 60 61 62 63 64 65 66 67
Value 32768 16384 8192 4096 2048 1024 512 256
Bit 0 1 0 0 0 0 0 1
How good ending you get depends on how much time you´ve spent playing. I think there are about 22 ticks/units per second but i have not explored this function further. However, since we all want the "bikini" ending we set these bits to 00000000 00000000.


You don´t have to do this, but i´ll explain how it works anyway. Bits 80-83 stores a number between 0-15. If the number is 6 the bits 00-7F are rotated 6 bits to the right. Bits 7E-83 become bits 00-05. The program that interpretates the code then rotades the bits back to their original position. The whole point of this procedure is to confuse poeple trying to crack the password system. Set the rotation to zero (four blank bits).
The program checks the code using 8 control bits to ensure that you are not just entering some random letters. I figure that they are the result of an logical operation (and/or) that is applied on all bytes in the code. To calculate these bits would be tediuos work, so instead we try all 256 combinations, which is much faster unless you´re a genius.

Try the following combibations of the last two letters:
Second last letter:
0 1 2 3

Last letter:
0 1 2 3 4 5 6 7 8 9 A B C
D E F G H I J K L M N O P
Q R S T U V W X Y Z a b c
d e f g h i j k l m n o p
q r s t u v w x y z ? -
To speed up this testing process we press this combination on the joypad. Right, B, A, start (*beep* error try again!)


Once you have arranged your data you will need to convert it into letters. How convenient, below is a table for just that purpose.
0 000000 W 100000
1 000001 X 100001
2 000010 Y 100010
3 000011 Z 100011
4 000100 a 100100
5 000101 b 100101
6 000110 c 100110
7 000111 d 100111
8 001000 e 101000
9 001001 f 101001
A 001010 g 101010
B 001011 h 101011
C 001100 i 101100
D 001101 j 101101
E 001110 k 101110
F 001111 l 101111
G 010000 m 110000
H 010001 n 110001
I 010010 o 110010
J 010011 p 110011
K 010100 q 110100
L 010101 r 110101
M 010110 s 110110
N 010111 t 110111
O 011000 u 111000
P 011001 v 111001
Q 011010 w 111010
R 011011 x 111011
S 011100 y 111100
T 011101 z 111101
U 011110 ? 111110
V 011111 - 111111
My nightmare code drops you in tourian without armour. You only got 3 energy tanks, 144 missiles, the ice beam and the Maru mari. You´re practically dead if you get caught by a Metroid. Kraid and Ridley are dead so you only have a maximum of 150 missiles. Time set to 0, you will get the best ending if you finish.
000100 000000 001000 000000 000000 000000
4 1 8 0 0 0

000000 000000 000000 000000 000000 000011
0 0 0 0 0 3

100000 100110 010000 000000 000000 000000
a 9 O 0 0 0

000000 000000 010100 000000 000010 000000
0 0 K 0 2 L

Code converted to letters: 418000 000003
a9O000 00K02L
Some useful built in codes
Was the stuff above to complicated for you? Then why don´t try one of the wierd built in codes below.
8888KK KKKKKK 999999 999999 XXXXXX XXXXXX
KKKKKK KKKKKK KKKKKK KKKKKK KKKKKK KKKKKK

BBBBBB BBBBBB BBBBBB BBBBBB ZETROI DNINTE
BBBBBB AAAAAA BBBBBB IIIIII NDOc19 87????

gunpei yokoi? JUSTIN BAILEY JUSTIN BAILEY
X11111 XXXXXX ------ ------ ------ 000000

JUSTIN BAILEY justin bailey justin bailey
+blanks here+ +blanks here+ ------ ------
These are my codes. These are quite useful if you want to try something out or get somewhere quick.
Start as Samus without armour
000000 000020
000000 000020

No varia available
00W000 000000
000000 000008

Easy start (wavebeam)
000000 000000
Vm0000 00001-

Easy start (special ice beam)
000000 000000
-m0000 00003-

Ultimate ending
Tip. Use the energy tank in the roof where you start.
-?---- ---mC0
--y000 00y03Q
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97%
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Justin Bailey
Added on 2003-10-17 at 17:30:46
For your passcode enter "JUSTIN-BAILEY" on the top two lines. Fill the bottom two lines with spaces. You will start the game will all upgrades and you will appear as Samus without her suit.
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