What is ultimately the best game you've played but never finished

It's been over 26 years and I always come back to this gem. Still after countles of hours I just can't beat it.

Originally I had it for Sega Genesis and just recently bought for xbox but it doesn't help at all. For those who dont know the game, its called Comix Zone and it's unbelivably good!

Is there anyone who has actully finished it without saving? Also would be nice to hear what's your ultimate game pick that you have never actually finished?