"Gunslingers Gold" is an action shooter with a strong stealth component. Not only ou will be able to shoot down your enemies with your gun or rifle, but you will also be able to hide behind objects and backstab your enemies using your knife.
If you want to take your enemies by surprise be careful not to be spotted by them. Also, hanging too much behind their shoulders will make them hear you. They will also be able to call each other for support or they will hear your shots.
To move around use WASD or the arrow keys. The mouse is used to aim and to shoot or stab by left clicking.
For a better explanation of the game mechanics, please have a look at the guide: