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Game Resources / G Bx / Final Fantasy Legend

The RNG

As with other RPGs, Final Fantasy Legend also has an RNG. It is difficult to manipulate, as it will only increment through actions, or get shuffled by a soft reset. The soft reset RNG manipulation is mostly frame-based, but something like entering a menu can slightly affect it.

Unfortunately, soft resets seem to revert to a default for the battle RNG, meaning if it's impossible to win after a reset, there's no way to manipulate that short of getting into another battle before the impossible one, and don't reset along the way.

RNG Addresses

Final Fantasy Legend uses a different address for almost every different effect possible. There are 128 such addresses, stored in the RAM from C300 through C37F. Manipulating one will not affect whether a different action is successful, as almost every action that needs an RNG has its own address it can use. With no known exception, each RNG address rolls once per use, incrementing by one after each use. For example, the Mutant growth RNG address, C30B is rolled once per mutant at the end of every battle; if it is 123 in a party of three mutants, it will increase to 126 after the next battle.

After resetting, each RNG reverts to a value offset from C300's by some amount that varies slightly. The formula for the offset of each value is believed to be
y=floor(9/64*x+b)
where
y is the offset amount
x is the difference between the RAM address in question and C300 (e.g., for RAM address C30B, x is 11)
b is the value of C300 plus some unknown fractional amount

The "unknown fractional amount" in b makes many of the RAM addresses inconsistent, but it also frees up an additional degree of freedom to manipulate luck. For example, C358's offset is +12 3/8. Roughly speaking, this means that when the game is (soft) reset, three out of eight times C358's value will be 13 higher than C300's; the five other times, it will be 12 higher. To check the feasibility of manipulating two addresses simultaneously, simply subtract their offsets. In the case of C30B and C34B, the net offset is +9, meaning C34B's value will always be 9 greater than C30B's value and those two addresses are "locked" to each other. It is therefore impossible to manipulate mutant bonus type and mutant abilities independently.

The following is an incomplete list of RNG addresses used by the game.

RAM Addr C300 Offset Notes Value Use
C309 +1 17/64 = +1.27 Mutant: HP growth 10 + INT(RNG*5/255) (conjectured)
C30B +1 35/64 = +1.55 Mutant: Bonus type
(Ability, HP, Mana, Agl., Str., Def., shuffle uses, or none)
0-34: New ability; 35-68: HP up; 69-98: Mana up; 99-116: Agl. up; 117-134: Str. up;
135-142: Def. up; 143-146: shuffle abilities; 147-255: nothing
C30D +1 53/64 = +1.83 NPC: Which direction next? 0-42: south; 43-127: north; 128-212: west; 213-255: east
C30E +1 31/32 = +1.97 Mutant: Ability Uses shuffler 0-42: divide by 2 (then round down) or add 1 if no uses left; 43-127: add original number of uses;
128-212: subtract original number of uses; 213-255: reset to original number of uses
C31B +3 51/64 = +3.80 HP potion RNG Unknown
C323 +4 59/64 = +4.92 Battle: Run away 0-126: can't run; 127-255: can run
C325 +5 13/64 = +5.20 Flashy enemy fade-in animation
C326 +5 11/32 = +5.34 Broken; +1 each time Uses Shuffler picks a full decrease
C334 +7 5/16 = +7.31 Broken; +1 each time the Uses Shuffler picks a full increase
C33B +8 19/64 = +8.30 Random battle trigger Terrain dependent. Encounter rates include... Glider: 3; Plains: 5; Forest: 6; Swamp: 13; SU-ZAKU (by foot): 64
C343 +9 27/64 = +9.42 Encounter: Which monster groups do you fight? Seven possible encounters. Bins are 0-3 (very rare), 4-7, 8-15, 16-31, 32-63, 63-127, 128-255 (common).
C347 +9 63/64 = +9.98 Bonus from STRENGTH or AGILITY items Unknown
C34B +10 35/64 = +10.55 Mutant: Which ability does one get?
Mutant: Str., Def., Agl., or Mana growth
Ability: Rolled and incremented until the RNG is greater than or equal to 239.
Mana, Agl., and Str. growth: 1 + INT(RNG*4/255) (conjectured)
Def. growth: 1+INT(RNG*2/255) (conjectured)
C34F +11 7/64 = +11.11 Probably used for NPCs. Might be used to increment C369 with nearby NPC
C352 +11 17/32 = +11.53 Rolled when using STENCH in battle
C353 +11 43/64 = +11.67 Encounter: How many monsters in each group? Unknown
C358 +12 3/8 = +12.38 Item: POTION's recovery For POTION: INT(RNG*20/255). For X-POTION: INT(RNG*60/255).
C35A +12 21/32 = +12.66 Enemy targeting Unknown
C35C +12 15/16 = +12.94 Will a meat drop from an enemy? Unknown
C369 +14 49/64 = +14.77 NPC: Determines when an NPC will take a step, apparently. Unknown
C36F +15 39/64 = +15.61 Mutant: What one of four slots to put an ability? Unknown

RNG Table

All random numbers with the exception of those used in battles (which are poorly understood) are pulled from the same RNG table. This table has a period of 256 and runs through all values from 0 to 255.

In the following table, the row indicates the first byte while the column indicates the second byte. For example, if RAM address C30B is 162 (A2 in hex), the RNG will roll a (decimal) value of 88.

0 1 2 3 4 5 6 7 8 9 A B C D E F
0 60 153 152 141 20 225 79 149 108 169 183 29 187 14 159 218
1 156 185 7 82 116 254 239 74 204 201 168 194 91 17 192 69
2 252 217 167 205 212 222 112 213 211 233 8 93 4 49 32 154
3 163 249 184 18 203 190 47 10 115 246 151 130 100 81 127 133
4 67 230 24 242 107 158 207 234 19 214 200 157 196 113 224 90
5 28 198 135 45 11 126 144 53 76 182 40 66 219 145 64 197
6 124 166 216 178 84 94 15 170 172 150 119 221 123 177 95 26
7 220 134 56 109 180 62 175 117 243 118 232 2 27 209 255 250
8 195 102 103 114 235 30 176 106 147 86 72 226 68 241 96 37
9 99 70 248 173 139 1 16 181 51 54 87 61 164 238 63 186
A 3 38 88 50 43 33 143 42 44 22 247 162 251 206 223 101
B 92 6 71 237 52 65 208 245 140 9 104 125 155 174 128 122
C 188 25 231 13 148 97 48 21 236 41 55 98 59 142 31 165
D 227 57 120 210 244 129 111 202 179 73 215 189 36 110 191 58
E 131 89 39 77 171 161 240 85 83 105 136 34 132 78 160 229
F 35 121 199 146 75 193 80 138 12 137 23 253 228 46 0 5

Here is the same table in hex format:

0 1 2 3 4 5 6 7 8 9 A B C D E F
0 0x3C 0x99 0x98 0x8D 0x14 0xE1 0x4F 0x95 0x6C 0xA9 0xB7 0x1D 0xBB 0x0E 0x9F 0xDA
1 0x9C 0xB9 0x07 0x52 0x74 0xFE 0xEF 0x4A 0xCC 0xC9 0xA8 0xC2 0x5B 0x11 0xC0 0x45
2 0xFC 0xD9 0xA7 0xCD 0xD4 0xDE 0x70 0xD5 0xD3 0xE9 0x08 0x5D 0x04 0x31 0x20 0x9A
3 0xA3 0xF9 0xB8 0x12 0xCB 0xBE 0x2F 0x0A 0x73 0xF6 0x97 0x82 0x64 0x51 0x7F 0x85
4 0x43 0xE6 0x18 0xF2 0x6B 0x9E 0xCF 0xEA 0x13 0xD6 0xC8 0x9D 0xC4 0x71 0xE0 0x5A
5 0x1C 0xC6 0x87 0x2D 0x0B 0x7E 0x90 0x35 0x4C 0xB6 0x28 0x42 0xDB 0x91 0x40 0xC5
6 0x7C 0xA6 0xD8 0xB2 0x54 0x5E 0x0F 0xAA 0xAC 0x96 0x77 0xDD 0x7B 0xB1 0x5F 0x1A
7 0xDC 0x86 0x38 0x6D 0xB4 0x3E 0xAF 0x75 0xF3 0x76 0xE8 0x02 0x1B 0xD1 0xFF 0xFA
8 0xC3 0x66 0x67 0x72 0xEB 0x1E 0xB0 0x6A 0x93 0x56 0x48 0xE2 0x44 0xF1 0x60 0x25
9 0x63 0x46 0xF8 0xAD 0x8B 0x01 0x10 0xB5 0x33 0x36 0x57 0x3D 0xA4 0xEE 0x3F 0xBA
A 0x03 0x26 0x58 0x32 0x2B 0x21 0x8F 0x2A 0x2C 0x16 0xF7 0xA2 0xFB 0xCE 0xDF 0x65
B 0x5C 0x06 0x47 0xED 0x34 0x41 0xD0 0xF5 0x8C 0x09 0x68 0x7D 0x9B 0xAE 0x80 0x7A
C 0xBC 0x19 0xE7 0x0D 0x94 0x61 0x30 0x15 0xEC 0x29 0x37 0x62 0x3B 0x8E 0x1F 0xA5
D 0xE3 0x39 0x78 0xD2 0xF4 0x81 0x6F 0xCA 0xB3 0x49 0xD7 0xBD 0x24 0x6E 0xBF 0x3A
E 0x83 0x59 0x27 0x4D 0xAB 0xA1 0xF0 0x55 0x53 0x69 0x88 0x22 0x84 0x4E 0xA0 0xE5
F 0x23 0x79 0xC7 0x92 0x4B 0xC1 0x50 0x8A 0x0C 0x89 0x17 0xFD 0xE4 0x2E 0x00 0x05

Tricks

Some tricks and quirks that would be good to keep in mind.

The game only accepts input at a minimum of pairs

If you hold down a button for a single frame, the game won't even process it. You must hold each button you want to press for two frames rather than one.

The game uses AND logic, so releasing a button for a single frame gets a reaction.

In effect, turbo button pressing would be AA.AA.AA.AA. and so on.

Resets are faster than running

An optimal run away takes around 20 frames longer than an optimal reset. In addition, it is possible to manipulate C33B into giving you a high step count before another battle using a reset.

GEN-BU Skip

Have a Mutant learn TELEPOR before you fight GEN-BU. After you put the three KING items on the statue, use TELEPOR to get to the tower. Because you didn't walk on a certain trigger tile, poor GEN-BU never gets a chance to fight you.

STONE Book -- The Instant Art Kit

Bosses are immune to the PARA element, which includes many status effects and instant death. However, most have no immunity to the STONE element, in which petrification acts like instant death anyway.

The earliest you can get a STONE Book is in World 3, in a shop in the hidden town.

SAW Glitch

The SAW is an instant death item and a monster ability. Both the ability on a BEETLE or WARRIOR and the actual item has a chance to hit based on strength. It also has an additional requirement, in that your strength must be less than the enemy's defense for it to even work.

There are four battles where you can't STONE the boss, but have access to the SAW item. It's these battles where the SAW can prove useful.

Vital Hit Rate

The battle RNG insists on resetting back to a default state after a reset. As such, the first action will always hit or miss depending on how accurate it is.

For status spells, your Mana needs to be at least Enemy Mana-4 to guarantee a hit from the first shot. Most endgame bosses have a Mana of 100, so in order to petrify them in the first action, you need 96 Mana by the endgame.

For the SAW item, you need Str. of 75 or higher to hit first thing. Keep in mind that if your Str. is above the enemy's Def., it will never hit!

Forced battles notes

Enemy HP Death? Stone? Misc.
1-1 P-FROG 82 Yes Yes
1-1 KINGSWRD 103 Yes Yes
1-2 SKELETON
0-2 ASIGARU
20
20

Yes
Yes
Yes
1-1 STEWARD 20 Yes Yes
1-1 GEN-BU 250 Yes Can be skipped by TELEPOR
1-1 SEI-RYU 600 Yes No stoning item possible at this point
1-3 MOSQUITO 150 Yes Yes
1-1 GARLIC
1-1 SABERCAT
1-1 P-WORM
231
202
231
Yes
Yes
Yes
Yes
Yes
Yes
Gah, 3 durable groups
1-3 SABERCAT 202 Yes Yes
1-1 BYAK-KO 1000 Yes STONE book available by this time
1-3 ATOM ANT 295 Yes Yes
1-1 EVIL EYE 606 Yes Yes
1-1 MACHINE 1000 First forced enemy immune to STONE
1-1 SU-ZAKU 1500 Yes
1-1 ASHURA 2000
1-1 GEN-BU2 1500
1-1 SEI-RYU2 1750 Yes
1-1 BYAK-KO2 2000 Yes
1-1 SU-ZAKU2 2500 Yes
1-1 CREATOR 5000


See also



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GameResources/GBx/FinalFantasyLegend last edited by Bobo the King on 2010-11-26 09:11:13
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