Fu ManchuFilm?

Hi, I saw a film about 25 years ago and think it was one of the Fu Manchu series, so I was wondering if you had seen them you would be able to help me identify the film.

All I can remember was a corridor where the floor disappeared and there was a fiery/lava type liquid underneath. There was a strange door at the end of the corridor, maybe with a circular opening mechanism, and if you didn't open the door propery (with the proper sequence) the floor would open and you would fall in to the hod red liquid below. Does this ring any bells?

Thanks