You cannot turn a non-steam game into a steam game, however, you can add it to the list of your steam games by clicking the "add game" button in the "library" section. This will not make it a steam game, it will only cause the game to show up on the list.
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Garry's Mod was first released on the Valve content delivery service, Steam on November 29th 2006. It was originally a modification to Half-Life 2, but is now a standalone game.
The game is not sold in stores. It is sold on a game selling company called steam. You would need to make a account on steam and buy it there.
A standalone title is a game that completes its own story in the same volume that it started in. It is also described as a game without any prequels or sequels.
If you bought the game from steam, no. and if your trying to put a game on your computer and it keeps adding to steam, than un-install steam while your trying to install the game.
No it is not. It requires one of the games in the half life 2 series such as TF2 portal or half life 2.
No the games are sold from steam are for steam if you dont buy the game from steam it will not connect you to their network where you can achive the trophies ect. how ever if you already got it you can click top left conner and click on Add program you can add anything to steam from Ventrilo chat program to battlefield bad company 2 that you purchased even though its not from steam you can add the game to your steam collection so when you start steam you can click on the game from there to start it. Once again that will not add your game to their network because you didnt purchase it from them its just to make things easier for you.
Yes you can get it on steam but you must make an acount first. The game is $40.
You don't, it's a standalone game.
Open steam, Browse the game you want to start and double click it..
If you mean the orignal battlefield game (Battlefield 1942), then no, you do not, it is a standalone game.
No, because you are not using Steam to play the game, you are only using Steam to verify the game and to use the multiplayer parts of it. If you have a Mac version DVD/CD of the same game then you could still use it on steam if you register it on Steam.I THINK if you bought the Windows game on steam they will let you download the Mac version on the same machine. They have the full instructions on their web site.