Here's a thought. What if every Half-Life mod, Portal mod, or Source mod in general is canon? Just not directly connected to the main story, because they're all apart of the multiverse in Portal 2. You could also count the various Half-Life 2 beta storylines, aswell as Epistle 3. Even Half-Life 2 Survivor, Half-Life 2 Deathmatch, and Garry's Mod.
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That would make HDTF canon in an alternate universe and I don't even like HDTF being canon in its own universe.
That's an unfortunate side effect.
how dare you insult the masterpiece that is hunt down the freeman
YES
All of my fanfics are canon? I have a lot of fanfics.
garry's mod is cannon
alternate universe where the cat is successfully teleported and so is Gordon
Man i think the same ! For me each fanfiction/story or Drawing are parts of the Multiverse !