[PC] Call of Cthulhu: Prisoner of Ice (1995)

How:
Read about it on magazines, got on a Black Friday sale at GOG.
Pros:
- Nice tense atmosphere throughout the entire game
- Old school graphics, with pre-rendered 3D animations and drawn backgrounds
- Some nice cutscenes
Cons:
- I skipped a cutscene because I did actions in a different order
- The monsters are laughable
- Very easy puzzles
- Rushed-up unfolding of the story, weak characters

The Necronomicon!

I found the first part of the code via trial and error. This broke some parts of the game.

[PC] Call of Cthulhu: Shadow of the Comet (1993)

How:
Read about it on Hardcoregaming101, bought it on GOG during a winter sale.
Pros: 
- Cool creepy atmosphere and story
- Some nice puzzles
- Very nice graphics
Cons
- Spooky but very repetitive music
- Unintuitive interface, sometimes you must Use items, sometimes you just need to have them in your hands in the right place at the right time
- Easy to lose bearings in town, and understand which locations are accessible
- Slow dialogues
- Possible dead-ends
- Too much trial-and-error towards the end

The game comes with a separate mini-game called "Lovecraft Museum".