This inaugural main game, a 2003 first-person shooter for PC and Mac, immerses you in intense, cinematic World War II combat across the European Theater. The core gameplay involves participating in historical battles, fighting as American, British, and Soviet soldiers through interwoven campaigns. Key mechanics include squad-based combat and utilizing iron sights for aiming, establishing a standard for realistic wartime simulation in the genre.
The central focus of this main game is delivering a realistic depiction of WWII combat scenarios. Players engage in missions that cover famous historical engagements, such as the D-Day invasion and the Battle of Stalingrad. The gameplay loop emphasizes squad-based tactics, moving beyond simple run-and-gun action to incorporate coordinated movements and reliance on allied AI units.
This title established several core mechanics that would influence subsequent shooters. A significant feature is the emphasis on iron sights aiming, requiring players to physically sight down their weapon for increased accuracy, adding a layer of precision to firefights. Furthermore, the structure of the campaign ensures players experience the war from multiple perspectives, highlighting different strategic fronts across the European conflict.
As the foundational main game, the core experience is self-contained. There are currently no downloadable content (DLC) packs associated with this release. However, the game did receive one official expansion pack, which builds upon the base game's content and setting.
The game's narrative structure is built around recreating specific, high-stakes moments from the war. Players participate in intense operations, including the assault on Pegasus Bridge and critical engagements on the Eastern Front. These missions are meticulously designed to convey the scale and intensity of the historical events they represent, serving as the backbone of the single-player journey.
Medium level animated violence

Call of Duty Classic is a downloadable version of Call of Duty for Xbox 360 and PlayStation 3. It is an enhanced port of the original game featuring HD resolutions. Tokens to download the game ahead of its release were sold along with special "Hardened" and "Prestige" editions of Call of Duty: Modern Warfare 2, and the game was publicly released on December 2, 2009.

The Nokia N-Gage version of "Call of Duty" brings the intense World War II action of the acclaimed series to a portable format. Developed specifically for the N-Gage platform, this version offers a unique gaming experience that captures the essence of its console counterparts. Players engage in key battles from the European Theater, taking on the roles of American, British, and Soviet soldiers. Despite the handheld format, the game delivers a compelling narrative and a variety of missions that involve infantry combat, vehicle engagements, and strategic objectives. It retains the series' hallmark features, such as immersive environments and realistic sound effects, adapted for mobile play. The N-Gage version of "Call of Duty" offers fans the chance to experience the thrill of World War II combat on the go, making it a notable entry in the franchise's history.

The mobile port of Call of duty plays as a top down shooter where you play as a crew of 3 units that you select, each with their own unique abilities, there are enemies to shoot, obstacles to destroy and pickups to help you along the way. The goal of the game is to reach the end of each level with at least one of your 3 units still alive in each of the 9 levels.

"Call of Duty: United Offensive" is an expansion pack for the original "Call of Duty" (2003), developed by Gray Matter Interactive and published by Activision. Building on the intense World War II combat of the base game, "United Offensive" introduces new campaigns that expand the player's experience of the European Theater. Players take on the roles of American, British, and Soviet soldiers in three new interconnected campaigns, participating in iconic battles such as the Battle of the Bulge, the invasion of Sicily, and the struggle for Kharkov. The expansion features enhanced gameplay with new weapons, vehicles, and multiplayer modes, adding depth and variety to the combat experience. "United Offensive" is praised for its larger, more dynamic battlefields and its focus on teamwork and strategy. With improved graphics and sound design, it delivers a gripping and immersive wartime experience, making it a compelling addition to the "Call of Duty" series.