The definition of a noob is someone who fails to understand the basic game mechanics and/or refuses to learn from mistakes and/or declines the help of other players in those matters. It doesn't matter if you are a singleplayer or multiplayer gamer, both have an equal chance of not being a noob. If a player fails the first few times after being tossed in the cold waters of multiplayer that's usually part of the learning process. If he keeps getting his ass kicked and still refuses to learn anything from it that's being a noob. So please, stop trying to insult inexperienced or singleplayer players by mixing them together with that kind of people.
Noob = Newbie = New player
Experience is what ends being a noob. Game type has nothing to do with it. If someone has played a sufficient amount of time on only AI games they stop being a noob.
Failing to understand, getting something wrong, not being good, or even refusing to learn from mistakes has nothing to do with it. It only means someone is new to the experience or medium.
I feel stupid for arguing this.
I just didn't like your definition.
Although, you could say they are a noob to multiplayer specificity I guess.
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Oh yea, add 'Rillet' on steam or ICO and I'l play. Same name for both.