You can still get achievements even when you put in a code.
you have to have a cheat code or a cheat disk but on the Nintendo DSI you play the game and I am not sure when you get him but you buy him from the shop If you are referring to the Lego star wars iii the clone wars online beta Darth Maul is accessible by singing in to a facebook account and sharing 5 achievements.
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CWAgift10
don't cheat
mega
learn how to spell heroes
CWAGIFT10
CWAgift10 for new accounts only!
There are a lot of cheat codes that I'd doubt it would all fit on this answering box. But here's my advice: Google-search "star wars the clone wars lightsaber duels cheat codes" and it will give you several links.
yes there is a code
just type in hehotfirst on the cheat code bar
Read more: What_are_all_the_codes_for_Lego_star_wars_iii_beta