there've been so many itterations of worms, though i am pretty sure there was a worms 2 that was also very 2 dimensional, but had much better graphics than the first worms. i'm guessing 3d may have been the third installment.
yep, right on that page you linked... "So Worms 3D on the Mac? Yes indeedy - the third generation of Worms has gone all 3 dimensional on us..."
oh, and it's ppc, i wonder how that would play with all that eye candy via rosetta.