I just found out that Roller Coaster Tycoon 3: Platinum was added to Steam. I bought the game years ago, and unfortunately lost the disk. Is there any way to add RCT3 to Steam w/o the disk?


Roller Coaster Tycoon 3 cannot be added to steam through the activation key. It must be purchased through Steam to activate it.

For a list of all the games that can be activated on steam, see here:


If you want to put the game on your Game library as a Non Steam Game, then follow these steps:

Launch Steam.
Click the Games menu, choose Add a Non-Steam Game to My Library.
Browse for games on your computer or put a check next to the game(s) you wish to add to the Library.
Click Add Selected Programs


  • :( Alright, thanks anyways. I'll keep looking around, the disk has to be somewhere. – Dave C Jun 19 '13 at 20:05

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