I played MM4 when it came out, then tried World of Xeen much later, but it already came preinstalled so I didn't have to merge them myself. I only completed MM4 though so I can't really answer much questions about MM5 <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" /> good games though, yes. Though they basically only did what MM3 had already done before
