In my 2023 recap post, I mentioned being sad about not being able to finish Secret Kingdom for the MZ-700. It didn’t have anything completely remarkable (plot recap: find treasures, win) but I only attained eight out of ten treasures, giving me the feel of a gnawing gap.
LanHawk took this up as a challenge and first managed to extract the BASIC source code; it turns out he had trouble getting anything out of it (baltasarq from my comments also called it “weird and unreadable”) so Lance decided to just play the game using the posts I had so far as reference. He managed to find the last two treasures and send hints.
From the Museum of Computer Adventure Games.
First and most simply, I’d been carting around a SWORD the entire game, but apparently had never bothered to LOOK at it.
Since you need the sword to handle the random wolves, it needs to be held pretty much the entire game.
If you look at the sword the game says you’ve found something, and a *GOLD STUD* appears.
The second find is a bit messier and I can understand why I missed it. Look again at the tower room above. There’s a PARCHMENT which LOOKS WORTHLESS and I tried in vain to make it show a treasure map or the like.
GET PARCHMENT and TAKE PARCHMENT led to TRY ANOTHER COMMAND, so I thought I reached some sort of parser barrier, but that was in fact a hint. This was partially a problem with visualization; you are supposed to imagine the parchment is put against the wall, somehow. The right command is REMOVE.
Now with the window revealed you can go outside to get a medallion.
This means the long snow section which I assumed had to have something is in fact entirely a red herring. It seems like a lot of work for the author to have bothered. I half-suspect G. Clark had some ambitions but simply run out of room so had to stop.
I’m afraid there’s no deep insight here — I was hoping there would be some sort of grand step in the final puzzle which would change everything, but alas, I had already racked up the interesting treasures.
At least the loose thread doesn’t have to bother me any more!
Renga in Blue 
Congratulations! It always feels good to scratch the itch of a game unfinished.
Talk about completeness!! Well done!