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Mazes of Fate is a very recent title developed by Sabarasa Entertainment out of Argentina of all places. It's their first GBA title (they usually do mobile phone games) and it's brilliant in pretty much every way. This dungeon crawler is, in my opinion, both one of the best RPGs on GBA, and one of the best crawlers ever made in general. Though I'm only 13 hrs in, the storyline is really shaping up. This is a very polished game, it in no way feels like something that you'd expect from a small shop in south america. The problem is that very few will ever play it.
They're an unknown developer who wound up with a very small publisher, and it's a very bad time to release a GBA game even under the best of conditions. Gamestop/eb turned them down flat, and they haven't managed to get their game onto a single shelf worldwide. Copies of the game were sent to all major gaming media outlets, but so far nobody has put out a review. Right now, this game is relying entirely on word-of-mouth to sell.
Currently the game is only available on ebay and amazon. I've been watching the ebay quantity, and it looks like it's only sold about 25. So give the game a try. It makes a great stocking stuffer. And if you've got a friend into dungeon crawlers, pass a link over. For collectors, I also suspect that the retail version of this game may become valuable if the rom ever becomes a cult hit. (what little popularity it does have is due entirely to the 0-day gba crowd)
links and screenshots:
Official Page
purchase link
Preproduction work on a DS sequel has also begun.