If you want my opinion .. yes they have!! A couple of days back i tried to play with my old NES AND GOD were the games so hard... it dint realized it back then but when i compare games like megaman and castlevania on NES to the games we play today .. well... todays game are far to easy . I thought maybe it was due to the growing number of gamers who joins the gamin world every day.. Due to that well the developpers have no choice but to make their games easy.. Because in the era of the NES there was less gamer than today so developpers made games harder.. maybe you think this is nonsense but it aint !!! Think ? How much games did really have challenge while playing it ... The only one i can see is Prince of Persia