"Casual" usually means accessibility, AKA how easy is it for someone with no gaming experience to start the game and play it. If a game requires an in-depth tutorial or manual, it's probably not a casual game. Thus, someone who is defined primarily as a casual gamer will see gaming as a secondary hobby rather than a primary hobby. Compare this with a primarily-defined hardcore gamer, who sees games as a primary hobby, or a professional gamer who sees gaming as a full-time job they make money off of.
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