Activating this trainer:
NumPad1: Infinite Health/Stamina
NumPad2: Change Money By 500
NumPad3: Change XP By 50
NumPad4: Unlock All Characters
Max Special Power
This game creates code on the fly. Before trainer activation you must be ingame and your health/stamina must be shown on the screen. Press F1 and listen for 'Trainer activated'.
Unlock All Characters: Before using this option you must start a game and once you are at the confirmation screen, go to 'Select Characters', then select the NEXT character. Then activate this option and wait for 'Activated' sound. Then you are able to select all characters.
Please note this is a one-way-option. You cannot turn it off unless you restart the game. This does not permanently unlock the characters.
Unlock more trainer options including updates from here - River City Ransom: Undergr. Trainer