Gun (2005)

The main storyline, written by Hollywood screenwriter Randall Jahnson (The Mask of Zorro, 1998,) is linear. You will have to fight duels, defend towns against bandits, help build railway tracks, intervene in various conflicts, and kill heavily-armed bossed. There are also many side missions or alternative ways to earn money. You can play poker in the casino, help out farmers with their livestock, assist the local sheriff, or deliver items with the pony express. Other possibilities include bounty hunting, regular hunting for rare animals, mining for gold, and various rescue missions.