Since I'm now beginning to work in earnest on my dissertation, I'm dealing with the issue of which words to use. Most writing about video games chooses from the available options (computer game, video game, videogame, electronic game, digital game, interactive entertainment, entertainment software, etc.) and makes a case for why one term is different from another. The differences between, say, "computer game" and "video game" seem pretty clear, but what about "video game" and "videogame"? Most dictionaries do not include it, but some writers consciously use "videogame." Among the stack of books on my desk right now, for example, Ralph Baer's and Ian Bogost's both use "videogame."
I feel like this is a perennial question within game studies circles, but I can't find any outright discussion of why someone would choose "videogame" over "video game." Part of the problem lies in getting Google to tell the difference. I can speculate or come up with my own reasons, but what do you think? Which term do you use?