well go on Sonic Blitz3D UNLEASHED! Trailer (DOWNLOAD INCLUDED) and it will tell u
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go on sonic blitz3d unleashed trailer [download included] and it will tell u
from what i know its a fan made game on the PC so you can go download it free
Just go to Sonic Retro and you can download it from there
You can download it by asking the creator Neo Fire Sonic.
There's a lot of places to get it. If you go to Youtube search Blitzsonic or (sonicblitz for Unleashed version) and on some of the videos you can find links to models, levels, and the Sonic Blitz Engine itself