This game took around 5 hours to beat for the second time. The last time I beat it was in 2014 so I didnt have it memorized. I was surprised to beat it that quickly this time, as it took many hours and days previously. Final time should have been around 4 to 4 1/2 hours but I was playing a bad ROM of the game again. This happened last time as well and I had to get back to the final stage again, to then beat the final stage legit. I cheat with states here, to get back to where I was in the other rom, so that I can complete the final boss. Version 6 is the newest version of Karnov and the one to play. The middle version is definately bad and the final boss will not die. I wasted time practicing that boss and replaying these levels on the other ROM to get back to where I was.
An edited tutorial with commentary will be up soon.