Doom trilogy on modern consoles, thanks to an amazing Unity port that cleans up the visuals and adds controller , but it's also not difficult to find the old PC versions online.
There was a time when Doom was seen as a technological marvel, with developers racing to get the game running at an acceptable rate on consoles. The original console ports of Doom during the 16-bit era were notoriously terrible, but the game was running pretty much flawlessly on 32-bit systems. Over time, video game hardware improved to the point where running Doom was no longer a challenge. Nowadays, it has become a running gag for people to get Doom running on all kinds of devices, with there even being a version of Doom that runs on a pregnancy test.
There were a number of different versions of Doom on PC, and now a particularly rare version of the game has been found. John Romero ed a photo of a Doom CD to Twitter, which he described as the "Holy Grail" of the original ed versions of Doom. It's a CD pressing of the v1.9 version of the game, which has an unusual history.
The original version of Doom released in 1993 received several patches, the last of which was v.1.9. There was an updated version released in 1995, called The Ultimate Doom, which added a fourth episode. The original version received a final update to coincide with The Ultimate Doom. The CD version seen above was the last retail release of the PC version of Doom that was distributed in '95. The Ultimate Doom supplanted the original version of Doom, thanks to its new content, similar to how Doom 64 has new levels in its modern remaster.
The modern remaster of Doom that a lot of players are familiar with is based on The Ultimate Doom, as it contains the fourth episode. The 1.9 version of Doom was supplanted by The Ultimate Doom, which is likely why the CD version is so rare. It's easy enough to find the original version of Doom for free, as id Software made the source code available online for those who want to see how it was put together. The modern remasters of the Doom series are also cheap to buy, with all of the Doom games available on Game . There are many ways to play Doom in the modern era, but there are still some rare copies of the game out in the world.
Source: John Romero/Twitter