Fallout: New Vegas

  Fallout: New Vegas is a role-playing video game in the Fallout series developed by Obsidian Entertainment.   
   The game  is not a direct sequel to Fallout 3. Though the game offers a similar role-playing experience to Fallout 3, no characters from Fallout 3 appear. However, the game marks the return of many elements found in previous Fallout titles, including Marcus, a super-mutant from Fallout 2 .
  It has only single - player mode but it  is not bad at all .

  Platforms : PC , Xbox 360 and PS3 .