Do they hold up?
>>389367609
Not the steam versions.
>hold up
More like modern games are still catching up. Newer XCOMs are nowhere as deep or flexible as original UFO Defense. Terror from the Deep is a rushed skippable reskin, essentially its just a mod. Avoid other games like plague.
UFO Defense is GOAT. TFTD is UFO Defense but harder and with different flavour. Apocalypse was good but rushed, and its' Openxcom equivalent is still in early development.
Also get Openxcom, steam version works fine for it.