Ok, think back to all FPSs & RPGs you have ever played. You are granted the ability to go into this game. Like Tron & Matirx.
You can go into this game and go through the campaign. What game would you go into and what weapons would you use? Better yet. Everybody gets 3 games to pick.
Perfect Dark (N64)
Metal Gear Solid
Half Life (yes... I wanna goto Black Mesa)