Here's the info on it. I'm sure I originally saw it on youtube, but this is all I can find right now.
http://www.scary-crayon.com/games/tmnt12pc/
I remembered it clear as when I first saw it, it was that exact place where my game ended for me as the jump is impossible, and back in ~1990 I didn't know any cheat codes to get past that place. I actually thought at first it was an intentional road block that you wern't supposed to get past, so I ended up playing the game several times more looking for any alternative route. Nope, game over. So I packed it all up back in its box never to see the light of day again and moved onto other games and felt sad about actually buying this game. Actually the biggest kicker was it was a birthday present and I was super excited to get it. Ah well, also pretty much marked the end of any significant interest I also had in the tmnt universe.