Well just finished up the latest Frame Trap and their last topic was video game marks of shame. Basically games that you absolutely should have beaten but just haven't for whatever reason.
For me it's Final Fantasy 6. FF6 is probably my favorite game ever and is hands down my favorite FF game but I have never finished the damn thing. When I played it upon release with my Mom we made it right up to the final dungeon, but I always got so anxious about actually facing Kefka that I never actually went and beat him. Right now I'm playing through it again on Steam but I keep getting distracted. Hopefully some day I manage to finish it.
So what are your marks of shame?