Playing as Darth Vader in Star Wars: The Force Unleashed (Xbox 360)
No cheat code unlocks Darth Vader as a full-campaign playable character. However, you can play as him in specific modes:
Challenge Mode: Unlocked after beating the story once. Select Vader for specific challenge maps with unique objectives.
Multiplayer (Duel Mode): Vader is a selectable character for local/online versus matches.
Mods (PC Version Only): Community mods (e.g., "Play as Vader" script mods) exist for the PC port. Not possible on Xbox 360 without a JTAG/RGH hacked console (voids warranty, bans from Xbox Live).
The story centers on Starkiller (Galen Marek); Vader appears as a boss and NPC. Enjoy the narrative as intended.