Released back in 1996, the original Diablo is now playable in browsers!
A group of programmers (one of the programmers goes by GalaXyHaXz) played with the game’s source code for others to port the legendary game to other platforms. They began working on the project last year as part of a Diablo fan project “Devilution.” “In order to ensure that everything is preserved, Devilution keeps everything as it was originally designed,” states the Devilution team on Github. “This goes as far as bugs and badly written code in the original game. With that it serves as a base for developers to work with, making it much easier than before to update, fix, and port the game to other platforms.”
Then, a mod group called Rivsoft made the game playable for anyone with a web browser over at diablo.rivsoft.net. You can download the Devilution group’s source code, and just drag and drop it onto the screen to start playing.
If you own an actual copy of Diablo, you can drag and drop the DIABDAT.MPQ file from the game’s installed folder to play the full version. You can get more details here.