Action Replay Code for Luigi in Mario vs. Donkey Kong 2 (DS): None Official

No official Action Replay code unlocks Luigi in Mario vs. Donkey Kong 2: March of the Minis. Characters are fixed per level; developers never released such codes.

Unofficial Hacks (Not Recommended)

• Save editors / cheat databases online claim Luigi unlocks.
• Risks: Corrupt game cartridge save, brick DS (rare), instability, crashes.
• Action Replay DS requires hardware device + code entry — tedious and unreliable.

For Playable Luigi in a Similar Game

Try Mario vs. Donkey Kong: Minis on the Move (3DS eShop) or Mario vs. Donkey Kong: Tipping Stars (Wii U/3DS) — Luigi is playable in later entries.

Stick to the intended roster. The Minis are the stars here.