Headhunter - Platform: Dreamcast

All weapons with infinite ammunition
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The Star Locker contains all weapons with infinite 
ammunition. To open the Star Locker, break Hank Redwood's 
records in Leila mode, then complete the game. 
Note: You may not be able to complete the game normally 
if the Star Locker is used. 

Walk through walls
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Find a location with an elevator with a gate-like door. 
Hold L to crouch, then press A to open the elevator door. 
You can now walk through any wall on the current level.