I'm interested in hearing about games that exist off the main map of gaming: games that I can't buy from any of the common storefronts and games that aren't easily playable through an emulator.

Examples of things I'm interested in hearing about:

• Long-forgotten abandonware
• Homebrew games for consoles
• Romhacks
• Legally dubious fan-games
• Total conversion mods
• ARGs
• Web games (not ones on sites like Kongregate/GameJolt though)
• Independently distributed games (that you can't get through, say, itch.io)
• Games for systems that aren't currently emulatable
• Games that have been removed from distribution
• Games with servers or content that are no longer operational
• Anything else you think fits the question, really

Tell me about the game(s) you know of and what makes them noteworthy.

Everyone always refers to the coming of Eurogames a long time back, but I'm wondering about modern games. Where have they come? Where will they go? I'd say the art has gotten better, more eye-catching, but I'm more ambivalent about very recent (last five years) game mechanics.

https://twitter.com/TychoBolt/status/1182541355337289728?s=20

Found this on twitter, user TychoBolt compiled this list. There's a lot of information on many topics, as well as a ton of links to tools that aid in level design, narrative and more.

He also compiled this 122-paged guide on level design; full of tips and tricks for designing levels. I've looked through it for a bit and found quite a lot of interesting information, so I'd reckon this is a valuable asset to anyone developing/designing games.
https://twitter.com/TychoBolt/status/1272578494543904771?s=20

PDF available here: https://docs.google.com/document/d/1fAlf2MwEFTwePwzbP3try1H0aYa9kpVBHPBkyIq-caY/preview?pru=AAABcufoPRw*FOD948Ah7NzrIiGTixO_PQ