The game crashes pretty consistently on original NTSC hardware. I also got it to freeze up 1x in VICE in NTSC mode. I haven't played it much in PAL mode on VICE, but maybe that is better. Also, the bonus game Sub Hunt '20 always seems to crash when I surface the sub. I tried to reach out to Psytronik through their FB page, but got no response. When it doesn't crash, Sub Hunter is a lot of fun. I guess you get what you pay for.