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OP: If playing videogames (generalized) is a sin then so is using the internet(generalized).
That being said: What makes something in sin is it taking God's place. If you would rather play a video game than read your bible / go to church or whatever you do to connect with God, then yes, it is a sin. If it takes control of your life, yes it is a sin. But a videogame is just a piece of electronics, it has no more power than what you give it. The sin is in you (and me, and us all), not in the game.
That being said: What makes something in sin is it taking God's place. If you would rather play a video game than read your bible / go to church or whatever you do to connect with God, then yes, it is a sin. If it takes control of your life, yes it is a sin. But a videogame is just a piece of electronics, it has no more power than what you give it. The sin is in you (and me, and us all), not in the game.