This thread was inspired by Patinas thread of nearly the same name.
Now it cannot be games you just have never played, you must have had a controller in your hands and actually be in a level or world or track, etc.
I wish I could say Superman 64, but I spent hours trying to get to level 3 before giving up and executing the game by fire. That is an exaggeration, I just returned it to the local video store back then as it was a rental.
No need to twist my arm, I will tell you all the truth, the name of the video store was "Video Fantasy". I was there when it closed down, was so upset when their copy of "Jackie Chan's Who am I ", on VHS was still over five dollars on final markdown.
So in actuality, my least played game ever has to be the first PSV Uncharted game. Followed by Knack. I played Uncharted at a Gamestop at my local mall and knack at a gamestop in a mini nap near the Mall.
Fun fact, when I type in 'Gamestop' my auto-correct changes it to 'gangster'.
So how about you, which is your least played game of all time?