ITT: Games with good replayability

Games that you can play again and still greatly enjoy, whether right after on a New Game+ or a year later with a fresh playthrough.

pic very related. Magical every time.

Great to just start up at any time.

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Todd please go and stay go.

I can already see this game living longer than Doom.

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What can a TF2 clone achieve exactly?

Pic related.
I'm trying to replay it for the nth time and have never used "quakespasm" before. Guess I am going to drag these files into the Quake folder and cross my fingers.

Todd who? I don't know any Todd.

Do multiplayer only games really have "replayability"?