Is it "fan game" or "fangame"?

[Vitiman]

Here's a purely semantics question for you: How do you choose to spell it? I think a large portion of people in this community would spell it as "fangame", sans the space. But have you ever noticed spell checkers mark that as not really a word? Furthermore, take a look at the MFGG logo. Or hell, just ponder on the acronym for a moment: if it were "fangame", wouldn't it be MFG? Now, I'll level with you and say acronyms can be weird and don't always play by set rules. It's all down to aesthetic choices. Also, it was named by a teenager in 2001, so I'm thinking MFGG's acronym is not an accurate reflection of the spelling... except, look a little closer at any MFGG logo: below the acronym. Wouldn't you know it, MFGG officially spells it as "fan games"! Well I'll be dipped.

So then that begs the question: if most people spell it as one word, but then most sources seem to suggest two is more 'correct', how do you personally spell it? Do you have a preference? Do you alternate? Ever since I noticed this little quirk, I've found myself casually alternating it from that point onward. Funny how that works!