Tunic — You need to figure out the game's manual to know how to play. Souls-style exploration and combat.
Papers, Please — If you liked Rocket Shop, you'll like this. You are a border guard, checking people's documents and choosing if they can enter. The rules change every day as international tensions grow. Great plot with multiple endings, expressed with just your green and red stamps.
Hypnospace Outlaw (kind of) — You are a moderator in a fictional version of GeoCities in the last months of 1999. Your training is web pages and crusty point and click CD-ROM slideshows. It's heartfelt story about the impact of technology on society and a loving funeral for that era of the world wide web.
As even further stretches, there is TIS-100 and Shenzhen I/O, both Zachtronics games that have you do programming. The tutorial for TIS-100 just opens a PDF that looks like a crusty scan of an ancient computer manual, like you were learning to program on a C64 or something.