Phantasy Star III is often considered to be the black sheep of the series, but is still a unique RPG on its own, featuring 3 generations and multiple paths through the game. It is also part of the Phantasy Star Collection re-release on GBA. Unique to this port is an inventory underflow glitch that ordinarily crashes on every other version of the game, but can be used in that port to take advantage of its unique benefits.
Twisted_Eye does just that and completes the game in record time. Please read the author's comments for more details.