Prior to 3.1.x the dat subdirectory didn't exist yet but data.base was present somewhere, possibly in the src subdirectory instead. I don't know whether it goes as far back as hack 1.x or even nethack 2.x. The source code for a bunch of old versions is present at https://nethackwiki.com/ but I'm not sure whether the data files are all there too. The source code for the most recent released version (3.6.7) is... Source: about 1 year ago

I am not sure what extra benefits the Steam version has, but the game is available for free either as download on nethack.org, or to play online at something like alt.org/nethack or hardfought.org. Source: about 1 year ago

You don't even need two people to play D&D, Nethack is great! Source: about 1 year ago

I've always been fond of the last quote on nethack.org. Source: over 1 year ago

It was discussed here last fall, when the home page for nethack.org was updated to mention it. The blurb includes a few other tiny screen shots and says the exhibit is scheduled to be open until mid-July. Source: over 1 year ago

I love these kinds of sandbox games, Orb Farm was super nice to have it running directly in the browser for a little procrastination break. Although my favorite is probably The Powder Toy [0], I've been following this project for years. [0] https://powdertoy.co.uk/. - Source: Hacker News / about 1 year ago

I play The Powder Toy https://powdertoy.co.uk/. Source: about 1 year ago

Yes, if you look in the sidebar on Reddit you can see a link pointing you to powdertoy.co.uk. Source: over 1 year ago

Powder Toy is not only my favorite but available on Android. Source: over 1 year ago

The Powder Toy probably fits this. As the name suggests, it's more of a toy than a game, and you may have already played a form of it if you're older. If you remember the falling sand web games from awhile back, The Powder Toy is basically that concept but run further than you might expect. Source: over 1 year ago