The [Diablo] game engine will stop creating random levels after midnight of January 1, 2039. Any game started before January 1, 1970, will also not be random.
You've doubtless heard it elsewhere, but The World Ends With You is pretty much amazing. If you have a DS, go buy it. The upper Gamestop at Southridge is likely to still have copies in stock.
First and foremost, do not play Unlimited Saga. If this post gives you any inclination to do so, please resist the temptation. Unlimited Saga is not fun.