Star Wars: The Force Unleashed (Xbox 360) — No 2-Player Mode

Star Wars: The Force Unleashed (2008) on Xbox 360 has zero multiplayer modes. It is a purely single-player action game.

What Exists Instead

• Online Leaderboards: Score/time attack rankings (Xbox Live).
• DLC Missions: "Jedi Temple", "Tatooine", "Hoth" — single-player only.
• Costume Unlocks: Via codes/achievements.

Multiplayer in the Series

• TFU II (2010): Also single-player only.
• PSP / Wii / PS2 Versions: Feature local versus/duel modes (distinct builds by different studios).
• Star Wars: Battlefront (2004/2005) & Battlefront II (2005) — Large-scale multiplayer (Xbox Live original / System Link). Backward compatible on 360.

If you want co-op Force powers, look at Jedi: Fallen Order (no co-op) or LEGO Star Wars: The Skywalker Saga (2-player local co-op).