Extra fire power:
Press A(4), Select(4), Right(2), Start. Game play will begin with 300 machine gun bullets and unlimited normal bullets.

Unlimited ammunition:
Press Right(4), Select(4), Right(2) at the title screen.

Machine gun:
Press A(4), Right(2) to start game play with a machine gun with 100 bullets.

Hint: Free wanted signs:
There are two people (a man and woman) who sell items in the game. They sell guns, wanted signs, ammunition, and horses. That is who is referred to in the following tips.

Level 1
After you pass the man (who sells horses and ammunition), there is a blue building on your left. This will also be the first building on your left. Under the roof of the building there a barrel. Shoot the barrel until a moneybag appears. After it appears, do not pick it up. Shoot the moneybag until a wanted sign appears.

Level 2
After you pass the man (who sells guns), there will be a barrel to your left. It will also be the very first barrel to your left. Shoot the barrel until a cow head appears. Then, shoot the cow head until a wanted sign appears.

Level 3
In this particular level there are three people that sell items. They are two men (who have the same appearance) and a woman. After the second man (who sells guns), there will be barrel to your left. Again, it is the very first barrel on your left. Shoot the barrel until a cow head appears. Then, shoot the cow head until a wanted sign appears.