Shinobi is my jam! I'll have to load it up. If you finish the game normally you typically end up with around 300,000 points. Using the no-shooting 20,000pt bonus technique that JSmith mentioned, I've gone over 600,000. I never felt like I really mastered it though. http://replay.marpirc.net/r/shinobi reports a high score of 774,920 but imo anything without a video of the player's hands is suspect.