Call of Duty 4: Modern Warfare is the fourth game of the Call of Duty series. It focuses in the arena of specialized combat in modern times. The single player campaign puts you in the shoes of both an U.S Marine and a British S.A.S Commando. The missions in the game are located throughout the world in locations like Russia, Ukraine and the Middle East. The game has a very large player base, mainly keeping themselves busy with the multi player feature. The general critics view is that this is a great game. But it was not perfect, there were several small issues that plagued the game, even after patch 1.5 there were small bugs that had to be fixed. So Infinity Ward released version 1.6 to fix all those bugs. This patch also includes a fix that prevents a DoS (denial of service) attack on the game. Just as a plus, the developers included four new multi player maps: Creek, Chinatown, Broadcast, and Killhouse. As with the original maps, these are very fun and have a very good quality. It also adds a filter for multi player servers, so you can select those with hardcore or old school mode. If you haven't updated to 1.6 you should, the maps alone make it a worthy download.