After that I went to 'Eye of the Hurricane 3' (answer 16), and went to 'Princes 2' from there.
EDIT: In Artful Dodger 1, it is hard to see because of the font, but the words 'Matrix' '20' and 'XX' are hilighted. They are plain text otherwise, so it looks like the code must be some combination of those things. Going by previous examples, it should be 'Matrix20XX', but that does not appear to work.