TR-49 is an excellent little puzzle game, available for a low enough price right now on Steam, and well worth going through. Starting off as a regular mystery about the inner workings of a computer system, it turns into a story of over a century of heartbreak, angst, bravado and science fiction, with threads coming together in sometimes unexpected ways.
Highly recommended, there are some slightly easier or more difficult puzzles but one can turn the hints down and it's a nice headscratcher. Took me about 4 hours to work my way through, which is a nice timeframe for something like this.
store.steampowered.com/app/383…
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A World War II computer. An archive of lost books. A world-changing secret. Narrative deduction meets audio drama, from the creators of Overboard!, Heaven's Vault and A Highland Song.store.steampowered.com