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It is not possible to play RCT3 without installing it via a disk.
there was a patch years ago that allowed people to play it without needing a disc.
unfortunately, you need the disk to play the sims 3. it's for security reasons.
You create a steam account and download the steam app
There is no way to get it without the Halo 3: ODST Campaign disk.
There are a few different external disk drives you can get that will play Sims 3. You can try getting the 250g external disk drive.
Then you shouldn't have downloaded illegally. well,that happend with me and my friend helped me find an answer to how to play it without disk and we went to this web called no CD (gamecopyworld)
In the disk version you need a disk to play in the download version you do not
On the second disk, the multiplayer disk.
yes you do or it wont work :)
well you defiantly can play solo on Halo 3...in fact that's all i played