Tomb Raider - The Last Revelation - Platform: Dreamcast

All Weapons, Infinite Ammo, Medipacks
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Face Lara exactly north, then enter the inventory. 
Highlight Small Medipack and press L, Up, X, Up, R, Y. 

Infinite LaserSight Amm:
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Combine the Crossbow or Revolver with the LaserSight, Zoom in, 
hold L and press Start. 
Select the Pistols and press A. Exit the pause screen. 
All while still holding L.