Call of Juarez: Bound in Blood [cheats]

Various bonuses
Enter 735S653J or 585A926D as a code. This will unlock extra money for equipment in Single Player mode, extra money for character unlocking in Multi-player mode, silver weapons in Multi-player mode, and the Superb Ranger weapon that can be used during the first two chapters.

Very Hard difficulty
Successfully complete Single Player mode.

Avoid losing momentum
Jumping and switching weapons while in mid-air is a good way to help keep your current speed and momentum. This helps a lot if you find yourself being chased by someone in a multi-player game and are low or out of ammunition for your current weapon.

Extras
For extra money in single-player and multiplayer modes, "silver weapons" in multiplayer and an exclusive weapon for the first two chapters, enter this code under "Exclusive Content" (Main Menu): 735S653J