Call of Duty 4 / Call of Duty World at War Gamer Lessons and Pro Gaming Trainers

Call of Duty 4: Modern Warfare is a first-person shooter video game, developed by Infinity Ward and published by Activision for Mac OS X, PlayStation 3, Windows, and Xbox 360. The game was released in North America, Australia, and Europe in November 2007 for video game consoles and Windows, and it was released for the Mac in September 2008. It is the fourth installment in the Call of Duty video game series, excluding expansion packs. The game breaks away from the World War II setting of previous games in the series and is instead set in modern times. Call of Duty 4 was in development for two years, and it uses a proprietary game engine. A sequel to Call of Duty 4 titled Modern Warfare 2 is due for release on November 10, 2009.

The story takes place in a fictional near-future, where a radical leader has staged a coup d'état in the Middle East, and an "Ultranationalist" movement has instigated a civil war in Russia. The events of the conflicts are seen from the perspectives of an American Marine and a British SAS commando, and are set in multiple locations, including the Middle East, Azerbaijan, Russia, and Prypiat, Ukraine. The multiplayer portion of the game features various game modes, and contains a leveling system that allows the player to unlock additional weapons, weapon attachments, and camouflage schemes as they advance.

Call of Duty: World at War is a first-person shooter video game developed by Treyarch and published by Activision for Microsoft Windows, Nintendo DS, PlayStation 2, PlayStation 3, Wii, and Xbox 360. It is the fifth installment in the Call of Duty series excluding expansion packs. The game's setting returns to World War II, after the previous title Call of Duty 4: Modern Warfare's modern setting. It focuses on the Pacific Theater and Eastern Front of World War II in the Microsoft Windows, PS3, Wii and Xbox 360 version. The title, game details and estimated release date were announced on June 23, 2008 and the game was released worldwide between November 11, 2008 and November 14, 2008. A Windows Mobile version was also made available by Glu Mobile and different storyline versions for the PS2 and Nintendo DS were made, but remain in the World War II setting. The game uses an enhanced version of Call of Duty 4's game engine with increased development in audio effects.

The story for the PC, PS3, Wii and Xbox 360 focuses on the initial battles of World War II in the Pacific and Eastern Europe involving the United States, the Empire of Japan, the Soviet Union, and Nazi Germany. It is told from the perspectives of a Marine Raider and a Red Army soldier and is based on several historical battles, including the Makin Island raid, the Battle of Stalingrad, the Battle of Peleliu, the Battle of the Seelow Heights, the Battle of Okinawa, and the Battle of Berlin. The multiplayer portion of the game contains various game modes and a leveling system that allows the player to unlock additional weapons and rewards as they progress, which was originally implemented in Call of Duty 4. A new feature to the Call of Duty series is the cooperative mode, which can support up to four players online and two offline.