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: It was the first in the series to move away from World War II to a modern-day conflict involving a Russian civil war and Middle Eastern separatists.

: Pioneered the use of "Perks" (special abilities) and "Killstreaks" (like UAVs or airstrikes), which became standard in later shooters. call-of-duty-4-modern-warfare-full-kuyhaa

: The original PC version supports a vast array of community-made mods, ranging from new maps to total gameplay overhauls. : It was the first in the series

: Unlike many newer titles, COD4 allows for community-hosted servers, which has kept its multiplayer alive for over a decade. : Unlike many newer titles, COD4 allows for

: Known for intense, scripted missions like "All Ghillied Up," where you play as a sniper in Chernobyl.

A "good feature" on (COD4) typically highlights why it remains a landmark title in the shooter genre, even years after its 2007 release.