What video or arcade games have you invested oodles of time and quarters playing and never finished?

I never finished Mike Tyson’s super Punch out.

I’ve never finished Final Fantasy 2.
I have never finished Indiana Jones and the Temple of Doom.

On the flip side what games have you finished or mastered?

I have almost won Terminator two the arcade game. Cost $50 or more to get there with my dad at an arcade at the circus.