I'd recommend that you don't get Fall-Out3, or Prototype. Reasons: They both don't last long. For example Prototype is only 8 hours of play? Fall-Out has what seems like unlimited missions. (Like Oblivion) Halo 3 ODST has missions, achievements that are required to beat the game, online play, forage, ect. (If you have just Halo 3 you get much more.)