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A bit of up front information:
This game is almost 100% based on free, openly available source code. This game was originally released in Spanish here: Zeldaelreinodorado.foroactivo.com
I translated it to English and posted the full source code along with various bugfixes, here: Github.com
This "4Swords.inc" has taken the work of the community and is attempting to profit off of it in addition to claiming it as their own work.
Now, the game:
The game itself is quite a bit of fun. There is quite a bit to do, many items and even quests to collect and do.
The dungeons are, for the most part, quite well-designed. The original designers/mappers did a phenomenal job with the game world, but do know that it is NOT 4Swords.inc that has done all this work.
It's a game that I think many people could enjoy, but I don't like to see it exploited for financial gain.