I sent @gbryant an e-mail to this effect a week or so ago, but I wanted to post here to see what other people think as well.
I think the Adder WS giveaway is a great idea, as is the general premise of how one goes about entering. However, I for one am finding the code-hunting process to be one long exercise in frustration. I have about 30 entries as of this writing, and I'm flabbergasted at the number of codes still apparently in the wild. I can't help but wonder just how many have been staring me in the face, in plain sight, but for whatever reason I haven't seen. I also don't know if Gardiner has added new codes to places I've already looked, or how many codes are actually "in the wild" out of the total number displayed when you submit a valid entry.
In short, everything is a free-for-all. That may well have been Gardiner's intent, but it's this lack of structure that I find particularly annoying, especially given the fact that I cut my gaming teeth, so to speak, on adventure games--especially titles from Sierra such as King's Quest, Quest for Glory, etc. Those games emphasized solving puzzles, looking for clues, being "on the trail" of an item, a person, or a piece of information. One clue led to another, then another, and so on. There were often red herrings and dead ends, to be sure, but you almost always had some idea of where you could go next, what to try, etc. My mind has been primed to this day to love puzzles and mysteries.
That's what leads me to my suggestion for future giveaways. Instead of a random free-for-all, the next one should be more of a "treasure hunt" than a "scavenger hunt." Gardiner should provide clues as to where the next item, puzzle piece, etc. could be found. Lead players in multiple directions at once, to dead ends or down the wrong path entirely, to be sure, but give players some structure and a sense of "getting somewhere." This giveaway, meanwhile, is just an aimless search.
I know Gardiner has provided some hints as to where codes can be found, of course, but I still hope you all can see my point. Interested to see what others may think.