There's a SNES ROMhack out there that has a lot of the bugs fixed without touching the translation or anything. That's the best version of the game IMO, the retranslation in the GBA release sucks and the GBA version has slowdown and crappy sound. It's not worth the bonus dungeons, especially if you've never played the original.
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Game of the decade? More like Guru of the decade mirite?
However, the Guru of the next decade so far is SuperNiceDog