Sure, here are the most popular games that were released in 2004, grouped by genre:

* **Action:**
    * Grand Theft Auto: San Andreas (Multiplatform)
    * Half-Life 2 (PC)
    * Halo 2 (Xbox)
    * Metal Gear Solid 3: Snake Eater (PlayStation 2)
    * Ninja Gaiden (Xbox)
* **Adventure:**
    * Beyond Good & Evil (Multiplatform)
    * Prince of Persia: Warrior Within (Xbox)
    * The Legend of Zelda: The Minish Cap (Game Boy Advance)
* **RPG:**
    * Dragon Quest VIII: Journey of the Cursed King (PlayStation 2)
    * Fire Emblem: The Sacred Stones (Game Boy Advance)
    * Shin Megami Tensei: Nocturne (PlayStation 2)
* **Simulation:**
    * The Sims 2 (PC)
    * World of Warcraft (PC)
    * Gran Turismo 4 (PlayStation 2)
* **Sports:**
    * Madden NFL 2005 (Multiplatform)
    * NBA Live 2005 (Multiplatform)
    * Tony Hawk's Underground 2 (Multiplatform)

These are just a few of the many great games that were released in 2004. It was a banner year for gaming, with some truly groundbreaking titles being released.
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