A good quest should bne started by identifying its purpose. One quest might be pure action and not rely at all on puzzles and mystic clues. Another might have a little action but lots of puzzlers. I myself prefer a mix. It may be a cool idea to compile a list of some of the better ideas into a "zoo" quest (one in which you can explore how certain concepts function, but with no real goal). Originality is perhaps the biggest key to a good quest, not that you aren't using some ideas from other people necessarily, but that it isn't identical to what's been done. Apply old traps and puzzles in new situations, creat new ways of combining elements, or storyline concepts. And difficulty is also key. This is also connected to the type and purpose of the quest. Is it for newbies to Zelda? Or do you want it to be an ultimate challenge? That's my random rant for the day.
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Procrastinor's Signature-to be filled in later...