Probably my favourite game ever, we owned the original with the map and manual.
I replayed it a couple of times as the TUQM, still loved it.
I tried replaying the original X-Com, but it had serious quality of life issues (squad members not remembering gear assignments between missions, no keyboard shortcuts during missions) so was just too tedious for me.
Apparently there is a reimplementation of the game out there which fixes these things, but at this point in my life my time is too limited.