Arma 2, a military simulation game where you can play around with everything from a T-72 tank to fighter jets. There are sniper rifles, Stinger missiles, laser target designators there are even bicycles, which you can ride.
CPU: Intel Core 2.4 GHz or AMD Dual-Core Athlon 2.5 GHz
RAM: 1 GB
Video Card: NVIDIA GeForce 8600GT or ATI Radeon HD 3650 or better
Free Disk Space: 10 GB