Gotta break the term up into two types, since those two types are pretty damn different.
mainstream casuals, and minigame/partygame casuals
mainstream: only plays the biggest games: CoD / Halo / Mario / Zelda / Madden / GTA / etc
minigame/partygame: they buy your Carnival Games, Just Dance, your licensed games, Wii Party, and popular mobile games
also, just because you play any one of these games doesn't mean you're appart of that catagory - it's only if those are the only games you play
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