Anchorhead

This is well-written and kept me on the edge of my seat! Play it alone on a gloomy day (no need for interruptions), with some rain sounds in the background and a mug of hot cocoa. This game really sucks you in so find a comfy place to sit.

The map is so involved it really helps to draw one to avoid getting lost or stuck - the directions can be a little confusing. I'd also recommend taking notes as you go (Spoiler - click to show)because there are some "research projects" that are fairly labor-intensive. Also some scenes only show up once.

It makes you think!

I wouldn't recommend it for brand new players, but once you understand the genre, it's a blast. This isn't a "power-through-it-fast" game, so take your time and enjoy!