Sorry to revive an old thread, but no-one posts her anyway... :)
Not sure about this replay (looks legit, but quite lucky), but there can be dirty work afoot even with single-segment...
Diablos levels are generated based on the date of your system clock when you start a new game. In fact, a certain date was found (probably through decompiling) in which all the levels had stairs generated close enough to skip the level completely, and where the necessary books were generated. This in turn made the run easy, as seen in this 9 minute speedrun:
http://www.youtube.com/watch?v=cN0bMhCj1MgIts akin to starting a doomrl game on nightmare where all the stairs are gauranteed to be next to one another, and a thermonuclear bomb is gauranteed to be found close to the stairs before level 25.
Re: The original post - Diablo is an extraordinarily difficult game if a player tries to play a single game with a single character. Essentially there just isnt enough experience per level to get a character strong enough to get through the caves and hell.
In fact, only a tiny handful of extremely hardcore diablo teams have managed to finish the game under hardcore rules without creating a new game with an existing character. They refer to this challenge as ironman, and its one of the hardest well-accepted gaming challenges there is - certainly harder than eternium man in adom. It\'s also bucketloads of fun, and if anyone wants to play ironman diablo with me, they should give me a PM. :)
Diablo becomes the ridiculously easy game we all remember when a player creates a new game with an existing character.