This is one of those Hypothetical what if questions.
I was thinking to myself what if I could only play three games for the rest of my life, which three would I choose. After contemplating this for a while my final list was:
Europa Universalis 3
Mount and Blade
Which got me thinking. I do enjoy linear pre packaged experiences but I tend to prefer a sandbox. I'd be interested to see what games you guys come up with. My colse runners up were X-Com, and something by Bethesda.