Are we talking about chronological order (i.e. Metal Gear Solid Ground Zeroes is the newest MGS game, but falls somewhere in the middle of the franchise's timeline) or order of the game's releases (i.e. MGS 1, 2, 3 - with 3 actually occurring before 1 and 2 in the story's timeframe)?
Anyhow, if I haven't played previous entries of a new game that looks good to me, I'll do some research and decide whether I feel it's necessary to play the previous ones. I don't like to be lost in the storyline. Otherwise I'll jump right into the new title. I sometimes find it difficult to go back and play older titles that I didn't manage to experience in the time of their release. Some of them age really badly and without the nostalgia of replaying games you loved, I usually hate them.

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