I completed all the 3 parts of Prince of Persia Trilogy, Even the part that came after that (the one with magician Girl ELika) But have never been able to play the Prince of Persia DOS game beyond first couple of traps... Tough for me !!
it gets boring ...after a while ...yeah its tough though ...(with mt IR Iball keyboard very tough)
deamon souls has the right blend of Gamplay and toughness...it never gets boring even if you have died a 100 times on the same place ( though its frustrating after 100 ...not boring)