Generating passwords for Road Rash 1 and 2 games

Recently, I saw a post about Road Rash on Habrahabr and I wondered: “How does the password system work in two other parts?”. I would like to share my observations and results with you in this article.

First Road Rash

Theory

The password consists of 20 positions, each position consists of 5 bits, a total of 20 * 5 = 100 bits. These bits save game data parameters:

• the number of the occupied place (0-15) on five different tracks (0 means that you have not traveled on this route yet).
• points count (0-10485750)
• the amount of money ((-83886070) -83886070)
• current level (1-5)
• motorcycle (1-8)

Now let's see what the raw password consists of:



(U, SN, SN, SN, SN) (U, PC, PC, PC, PC) (U, RF, RF, RF, RF) (U, PD, PD, PD, PD) (U, GV, GV , GV, GV) (H, H, H, H, H) (H, H, H, H, H) (H, H, H, H, H) (H, H, H, H, H) ( N, M, M, M, C1) (M, M, M, M, C1) (M, M, M, M, C1) (M, M, M, M, C1) (M, M, M, M, C1) (M, M, M, M, C1) (U, U, L, L, L) (U, U, B, B, B) (C2, C2, C2, C2, C2) (C3 , C3, C3, C3, C3) (C4, C4, C4, C4, C4)

')

Legend

U - unused bits.

SN is the number of the occupied space in Sierra Nevada (0-15) in binary number system.

PC is the number of the occupied space in the Pacific Coast (0-15) in binary number system.

RF is the number of the occupied space in Redwood Forest (0-15) in binary number system.

PD is the number of the occupied place in Palm Desert (0-15) in binary number system.

GV is the number of the occupied place in Grass Valey (0-15) in binary number system.

H - the number of points (0-10485750) in increments = 10. The number of points is divided by 10 and the resulting number is transferred to the binary number system.

N is a bit of negative values.

M - the amount of money ((-83886070) -83886070) with a step = 10.

In order to create a positive amount of money, you need to divide the amount of money by 10 and convert the resulting number into binary number system.

In order to create a negative amount of money, you need:

1. Activate a bit of negative values.
2. From the number 83886080 subtract the amount of money (by module), divide the resulting balance by 10 and convert the number to the binary number system.

L is the level number (1-5) in binary number system.

B is the number of the motorcycle (0-7) in binary number system.

Motorcycles	room
SHURIKEN 400	0
PANDA 600	one
BANZAI 750	2
KAMIKAZE 750	3
SHURIKEN 1000	four
FERRUCI 850	five
PANDA 750	6
DIABLO 1000	7

C1 = (sum of positions from 1 to 17) mod64 (The resulting number is transferred to the binary number system and mirrored).

C2 = (sum of positions from 6 to 10) mod32.

C3 = (sum of positions 11 through 15) mod32.

C4 = C2 XOR C3.

Coding

Characters in the positions can take the values ​​0-9 and AV. The bits in the positions are encoded in accordance with the fact that 0 = 00000, 1 = 00001, 2 = 00010 ... U = 11110, V = 11111. That is, this is a simple 5 bit encoding.

Second Road Rash

Theory

The password consists of 8 positions, each position consists of 5 bits, a total of 8 * 5 = 40 bits. These bits save game data parameters:

• trails at this level (0-5)
• amount of money (0-327670)
• current level (1-5)
• motorcycle (1-16)

Now let's see what the raw password consists of:



(?, M, M, M, C1) (M, M, M, M, C1) (M, M, M, M, C1) (M, M, M, M, C1) (U, U, L , L, L) (B, B, B, B, C1) (T, T, T, T, T) (C2, C2, C2, C2, C2)

Legend

? - always equal to zero.

U - unused bits.

M - the amount of money (0-327670) with a step = 10. The amount of money is divided by 10 and the resulting number is transferred to the binary number system.

L is the level number (1-5) in binary number system.

B is the number of the motorcycle (0-15) in binary number system.

Motorcycles	room
SHURIKEN 400	0
PANDA 500	one
SHURIKEN TT250	2
PANDA 900	3
BANZAI 7.11	four
BANZAI 600 N	five
BANZAI 750 N	6
SHURIKEN 1000 N	7
BANZAI 7.11 N	eight
DIABLO 1000 N	9
PANDA 600	ten
BANZAI 600	eleven
BANZAI 750	12
SHURIKEN 1000	13
DIABLO 1000	14
WILD THING	15

T - traces passed (0-5).

The order of bits from high to low:

4 - is responsible for passing the fifth route.

3 - is responsible for the passage of the fourth route.

2 - is responsible for passing the third route.

1 - is responsible for the passage of the second route.

0 - is responsible for passing the first track.

C1 = (sum of positions from 1 to 6, not counting the 5 position) mod32 (The resulting number is transferred to the binary number system and mirrored).

C2 = ((sum of positions from 1 to 6) mod32) XOR 7 position.

Coding

Coding of values ​​is the same as in the first part.







But that is not all!

I cooked something else ...

For dessert - Banana Prince

Let's digress a bit from the Sega console and move on to Nes (Dandy). This game is very patted my nerves. Who played, he remembers the long questions in Japanese, because of which the passing game turns into hell. Passwords in it are simple, but with a tackle. To complete the game 100% needed to collect 4 armor. But there is one problem, to get them, you had to answer a ton of questions. No matter how much I rummaged on the Internet and in my book of codes, I never found the passwords that save the collected armor. And without them, the final boss will send you to hell out of a ton of Japanese characters. But having rummaged in assignments of bits, I found that the game saves:

• the current level number (0-20) in decimal notation
• weapon number (0-15)
• armor (0-4)

The password consists of 8 positions, each position consists of 2 bits, a total of 8 * 2 = 16 bits.



Now let's see what the raw password consists of:



(C, C) (A, L) (L, L) (L, L) (C, C) (G, G) (A, A) (G, G)

Legend

C = (sum of all positions except 1 and 5) in binary number system. The two high-order bits of the checksum are written in position 5, and the two low-order bits in position 1.

A - the number of armor (0-4) in the binary number system.

L - level number (0-20) in binary number system.

Levels	room
1-1	0
1-2	one
1-3	2
2-1	3
2-2	four
2-3	five
3-1	6
3-2	7
3-3	eight
4-1	9
4-2	ten
4-3	eleven
5-1	12
5-2	13
5-3	14
6-1	15
6-2	sixteen
6-3	17
7-1	18
7-2	nineteen
7-3	20

G - weapon number (0-15) in binary number system.

Coding

For coding use 4 degrees of eating a banana, which we denote by numbers:

= 0 = 1 = 2 = 3

Conclusion

So we went to the finish line.





What would you like to say? Well, I hope this article is useful to someone. Good luck, thanks for reading.