

OpenXcom for the first two X-Com games (UFO: Enemy Unknown and X-Com: Terror From The Deep). This reimplementation is insanely good.
- It fixes all known bugs of the original X-Com engine.
- It works on modern systems, including Linux, macOS, Windows, and even Android.
- It has support for modern resolutions and aspect ratios.
- It allows you to use soundtracks from other versions of the game (e.g. look at the website’s “Extras” tab).
- It has mod support including a basic mod manager. And some of those mods are damn good.
- It runs flawlessly.
There’s really no reason to play the original DOS versions anymore.









I could argue that experiencing the Groundhog Day bug builds character but… no. Nobody should have to deal with that.
Admittedly, a few tactics like filling your base with laser rifles to make attacking aliens spawn unarmed no longer work. But honestly, an experienced player treats base attacks like bonus levels anyway so it’s not like much of value was lost. Besides, you also now get all the loot from big missions and not just the first 128 items.
Also, UFO now actually remembers your difficulty setting and doesn’t revert you to Beginner after the first mission. That’s different but better. I probably should’ve mentioned that separately in my first comment.