SA is for the Dreamcast, while SADX is for the GameCube. SADX has the 12 Sonic Game Gear games as unlockables. SADX has 60 missions in it. SADX has a black market in the Chao Garden. SADX allows you to put your chao in the Tiny Chao Garden. SADX awards you for collecting all 130 emblems. SADX has Cream cameos. There are more.
I'm pretty sure you can using an action replay or action replay max.
how can i unlock or do the moon gravity on spiderman2 for gamecube
in sonic adventure dx you can only unlock metal sonic by collecting 130 sonic emblems.
To unlock Metal Sonic you must collect 130 Sonic emblem
You cannot unlock Shadow in Sonic Adventure DX. Videos from YouTube that show him in SADX are hacks.
finish all other characters story then you will unlock super sonics story.
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no
Get a Gameshark or an Action Replay and hack it via codes. if you are playing the PC version get sadx memory editor if you are on the gamecube version i can't help you
NO!
you cannot unlock him, you need the action replay