All Weapons/Unlimited Ammo: 
At the Weapons Load Out screen, hold L1 + L2 +R1 + Circle + 
Triangle + Square and press Left. 

Big Fun: 
Enter these codes at the Password Screen 

BENIHILL - Faster back up cars
WOOWOO - Sirens
SUPACAM - Different camera angle
ALSECRET - All the secrets
PANTALON - Secret stages

Level Codes: 

01- MADGAV
02- DOLMAN
03 - SONAGAV
04- ACEDUF
05 JOJOGUN
06 WENSKI
07 SAEGGY
08 MAZMAN
09 DAZMAN
10 DELUCS
11 ANDOOOO
12 KIMBCHS
13 ANDYMAC
14 YERMAN
15 OLLIEB
16 THEYOLK
17 TONYMASH
18 ANDYCROW
19 BIONIC
20 TSLATER
21 IAINTHOD
22 JONRITZ
23 CLAIREC
24 STEVEBOT
25 ANGUSF
26 EUANLEC
27 EDFIRE
28 STUBOMB
29 THONBOY
30 JIMMAC
31 PUGGER
32 ROSSCO
33 CAKEBOY
34 NIKNAK
35 SAGLORD
GameShark codes 800f5cac 0063 - Infinite hyper missiles 800f5cb4 0063 - Infinite starbursts
800f5cbc 0063 - Cluster Bombs