IGN - It's easy to forget how unforgiving Counter-Strike can be. Valve's competitive online shooter truly rewards the skilled and stomps all over the newcomers. There are no Call of Duty-style kill streaks, no artillery barrages to call in or packs of dogs to let loose. It's just you, your guns, a few grenade types and your ability to react. Map knowledge, teamwork and quick reflexes are the only things that matter.