The following codes are for Star Fox: Assault (USA)

NTSC
(m) (Parasyte)
YXHA-6FMN-ZVV2P
W6YB-U23J-H9KJK
Infinite Bombs (The Pizza Boy)
WEFY-XXD5-FN69C
6A2F-2XY2-MC0DY
Infinite Lives (Kirby is cool)
XAC1-ZJ69-N59HD
9QM5-YRHM-AA57P
Infinite Health On Foot (All Players) (Link Master)
FVD8-X250-G7592
FEJX-6QUR-0W5A7
Infinite Health In Landmaster Tank (All Players) (Link Master)
TBKW-DR2K-6JQ7M
FUP3-7H25-A0FV9
Infinite Health In Arwing/Wolfen (All Players) (Link Master)
BMEW-PZV9-H74WA
G3TF-P6EK-PNT7K
YYX0-QKV2-URCD6
Max Hits (Kirby is cool)
TDGX-K58J-9WGZM
N8BP-ECH6-GDFM4
Instant Charge (donny2112)
D82F-MY65-TMRGN
TWGZ-05BV-PJXK7
Never lose combo (donny2112)
VXVU-64ZT-J20E9
4AHY-WYPN-KBYC6
Mission Time 0:00 (donny2112)
UN7G-T67U-85CGZ
J80R-7NNR-3UR34
Size Mod - Must Be On (kenobi)
KAVP-MN14-BZM70
UZHA-5NCZ-K90NA
Fox Size Mod - Grow/Shrink (D-pad Up/Down) (donny2112)
A7DU-0JRD-FJDV1
XC6Y-39HG-89F5C
F4MP-6D9G-38CF2
43ZH-0WR7-AHH81
PN16-59T8-0R77U
E9FZ-A3QA-YCERP
0H7U-74XH-7CPTG
ERHF-HE30-1ZJ1N
YXGB-GXYV-WV95X
EXEW-24AK-2W7R4
E9FZ-A3QA-YCERP
World Size Mod - Grow/Shrink (D-pad Left/Right) (donny2112)
HPBM-NV1A-6UF92
UTDN-73W0-R68A7
N8CQ-8WJ2-C3YX2
KYVE-QVNX-GN3J4
A83U-T4GW-22Z7R
E9FZ-A3QA-YCERP
48ER-59QF-XB6HX
2AGY-DHAW-F5XYX
9KE3-50AK-TC56A
VTGQ-F7C1-J1HNH
E9FZ-A3QA-YCERP
LEVEL CODES:
Fake Level Modifier (Multi) (Rune@GSC)
002995E4 000000XX
ie. Forces you to choose a particular level.
Menu Level Text Modifier (Multi) (Rune@GSC)
802995E5 000000XX
Digits:
00 - Katina Outpost
03 - Fichina
04 - Planet Sauria
05 - Corneria City
0F - Simple Map 5
Unlock Stuff In VS By Completing A Match (The Pizza Boy)
VGYF-66NW-0B2W0
3AJR-8J0V-TNPCM
Max Hits (The Pizza Boy)
A2VV-UV5Q-13TJR
9QM5-YRHM-AA57P
Infinite Ammo All Weapons (The Pizza Boy)
EYC6-N5Z2-0FT1A
ZUZ5-31AK-PJDWH
CHMF-N9KU-8JC4E
HERR-9H5D-G2VFY
WJWE-249U-4R931
0HE5-E3RV-FXUUA
R39W-HVY8-XFG0N
Infinite Booster Pack (All Players) (Link Master)
WK4D-MX68-Z77DP
CPJ4-DNF2-X1N3B
PAL
All by JAY007 unless noted otherwise
(m) Must Be on (Datel)
BKA3-E2NV-X2Q90
GRAG-Y5CQ-74846
D-Pad Up To Grow*
0A03-TNDA-P5Q5R
PFZV-1AGV-HW9QT
Y9JF-V58W-BREBK
QYYA-FDD0-7DN5W
X7J2-EY46-3GYBQ
E9FZ-A3QA-YCERP
D-Pad Down To Shrink*
B3N5-55D3-6005G
WZ1U-M1RE-C32ZX
K0KJ-RMB1-H9RD8
K84Q-1JHR-7VTQH
KGB9-M5G7-XT306
E9FZ-A3QA-YCERP
*Becareful when using these*
Charged Shot Codes
On Foot
Fire Fully Charged Shot Player 1 (R+Z)
PK4Q-2Y5G-Z6KWR
TQRC-48N2-PW35D
HHVX-FMTT-3VBN9
Fire Fully Charged Shot Player 2 (R+Z)
KPYM-JY9U-Y1GBQ
QPEC-36DH-TFX93
7K08-G03N-2F9DD
Xevious Bonus Game Codes
Backup your save before using the below 2 codes
Xevious - Max Score
JZ8C-DBD0-FHHUA
321R-WN3G-WY24R
BPZA-4AGR-ZXQ56
8APU-M1TG-6PZ7P
Xevious - Infinite Lives
ZPXK-VXA3-RMC85
Z7AD-NMY5-C3ZK6
GZVR-K2F5-BQXMT
Multiplayer Codes
Always Have Jetpacks Equipped (Multiplayer Only)*
RDWA-0X8V-CRCYU
7D3H-WZ8W-Z4Q6J
*Vehicles can still be used aswell*
Character Mods (Multiplayer Only)
Player 1
002BD20B 0000000X
Player 2
002BD20C 0000000X
Player 3
002BD20D 0000000X
Player 4
002BD20E 0000000X
XX Digits
00 - Fox
01 - Falco
02 - Slippy
03 - Krystal
04 - Peppy
05 - Wolf
Play 1 VS Match For MP Extra's
W5XG-Q1ED-9W5WZ
5AHJ-Q8AE-VJM12
Other Codes
Max Hits
59U9-V9MH-WY402
9KN0-2FYT-K6MVP
Mission Time = 00:00:00
5J18-DBZ2-04XBF
Z6YF-4VF5-4K3XJ
Max Combo's
X357-6UUN-WUG7J
3J5Q-Z1KZ-4Q2XX
Infinite Combo Meter
HK80-YMTT-R57Q7
Y4X9-MAMX-0V7MY
Fuel Codes
Infinite Hover: Jetpack
XRWM-4A9B-HKZTQ
FFXR-7KW2-6UB21
Infinite Hover: Landmaster
G6JU-8D7G-0GZBZ
DHB2-N0FY-1F4WK
Infinite Boost/Brake Arwing/Wolfen
C2KV-JNG9-CVPQ1
38P7-PH7D-4YXT6
0Q91-G1PY-0Q1E0
M0GP-MYEM-2XYVR
WCU1-K0JP-80RJ6