Gameboy Advance Console
Ballistic - Ecks vs. Sever 2

Multi-player linkup:
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You can link up a Game Boy Advance with Ecks vs. Sever and a
Game Boy Advance with Ballistic: Ecks vs. Sever 2 and still play
all the multi-payer modes. The level combinations between the
games are slightly glitched, but it still works.

Code       Result
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DEATHWISH - Invincibility
OOHSTOPIT - One shot kills
MYBIGUN   - Rapid fire, shotgun 
ACMEBANGS - Extra explosion damage
COLDFEET  - Stupid AI
DOYOUCME  - Invisibility

A Few level passwords
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To access levels Ballistics: Ecks Vs Sever you need to input a password
for that stage, here are some passwords for early stages:

ECKS MISSIONS
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level 2: smokey
level 3: butterfly
level 4: covey
level 5: tiger

SEVER MISSIONS
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level 2: raven
level 3: firefly
Level 4: Bulldog
Level 5: Dragon
Level 6: Loudmouth
Level 7: Stinger.