Return of the Obra Dinn: Amazing mystery/detective game. However once you've played it, you basically can't play it again as you remember the solution already and the challenge of the game is trivialized.
Chants of Sennaar: Really great game about deciphering languages. However, once again, by playing the game once, you'll remember the languages and the game has no challenge any more.
Outer Wilds: Mystery adventure game. There is some replayability as there are perhaps areas that you can still explore, but largely once you figure out the mystery and complete the game, there's not much more to experience. Some people speedrun the game though.

All of the above games I value extremely highly even though I only played them ~8-10 hours.

Do you have any others?

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[–] Radicaldog 8 points 9 months ago* (last edited 9 months ago)

A lot of people are posting games that are short and linear. But to match your energy, games that cannot be replayed unless you forget what you learn;

Case of the Golden Idol is a mystery/deduction game, a la Obra Dinn.
Toki Tori 2 is a puzzle metroidvania, where you can do your full moveset from the start - tweet and stomp. Right from the first screen, big chunks of the map can be shortcut through once you put your later learnings into practice.