Can i use the free source game i have for garrys mod?

[awesomslayer20]

The free source game i have is Hl2 dm from the ati offer. I installed it. Can i install/play garrys mod using that?

[Nick.exe]

Notice: This game requires that you own a Source engine game such as Counter-Strike: Source, Half-Life 2, or Day of Defeat: Source. Click [b][url=http://store.steampowered.com/search/?category2=16]here [/url][/b]for a full list of games that meet this requirement.[b] Please note that Portal: First Slice and the bundled Half-Life 2: Deathmatch do not fulfill this requirement.[/b]

[Zeloutional]

Just got [b]FUCKED[/b] up the ass.

[fog]

[QUOTE=Nick.exe;23732465]Portal: First Slice and the bundled Half-Life 2: Deathmatch do not fulfill this requirement.[/b][/QUOTE]

Funny, the free full game of Portal doesn't count either.