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There isn't a full version you download from the internet, but you can download the ps2 emulator and then find the download site for zero gravity. It isn't that great on the emulator but that's the only way to get it on your PC. also there's a wii emulater to play it on
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You can Download Sonic R for PC from.... http://games2bee.webs.com/apps/blog/?page=2
Android market or app store
from playdownstation.com