Tom Clancy's Rainbow Six 3 Cheats
Custom mission map select
Press Start at the main menu to enter the menu with "Campaign", "Custom Mission", "Split Screen", and other options.
Code: Press L1, R2, L2, R1, Left, Right, Square, Circle
After every fire fight, reload even if you have 22 rounds remaining. If you keep doing this, you should have enough ammunition for the long fire fights and levels.