When I first created this quest, it was when the tileset I am using was first created, this was during the release of 1.92 beta or something. I've been working at this quest for over 2 years, almost 3. I just wasn't working at it constantly, I've already given up at this quest after creating a crappy level 5 that uses a raft to complete the level, than a level 6 that just was losing creativity. But I than continued when I thought of an idea for level 6 having a huge poison pond like theme. Than as everything was going great, I almost erased it all, I copied over my quest, I thought it was all gone, so I quiet for months and months, but recently I found a copy of the quest, with much information gone, even level 6, magic, and many crazy things.
But there was that much done to the quest it would be a shame to not finish it, so I spent alot of time lately to finish it, and I'm really happy to finally upgrade it with 2.10 and finish all 9 levels.
As for that door, I found it. =p I think it returns Link back to a room where you came from, it's a bad glitch, but it doesn't threaten your current quest, so I have it fixed and added to the next update. =)