What single player games do you enjoy replaying?

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The amount of time I've spent going back and playing SNES games I've owned since I was a kid like Donkey Kong Country is crazy. A lot of games from back then are so good for just picking up and going through a dozen levels or so just for fun. There's not that barrier of commitment that newer games tend to have where you often can't just go back and select a certain level or section to replay.

The most I've played a game like that where you have to play through the campaign as a whole is RE4, which I have beaten 13 times to date.