Dazed, you slowly regain consciousness. You don’t know how you got here, but one thing is certain – your exploration of this otherworldly planet has reached an ugly end. Trapped in an alien crypt, what hope is there of escaping? There is only one door, and in front of that lie a physically innumerable number of keys of different materials. A leaden key, a silver key, a golden key, a wooden key, a copper key, a granite key, a sapphire key, the list goes on… You know there is no time to try all of them.
But there in front of you, lying on the high-tech tiled floor, is an arrangement of jewels. Is it a message left by a previous captive indicating which key to use? Is it a test by the aliens? It may be your only clue, so you had better interpret it quickly…
- Which key is this arrangment of jewels indicating you should try?
Hint:
Try looking at the general shape that each of the three colours forms. Once you have done that, you will have to combine this information with the colours themselves, and see what they mean together...
New Hint:
It's a long time since I was active on PSE, but I happened to check in today and see a bounty on this puzzle. I don't have much new to add because the puzzle was almost completely solved by @Vicky and @Amoz in the comments to the existing answer. I clarified in my comments in reply in 2021 that the correct words had been deduced, and the almost-intended rationale for the solution found. My solution involves a double-definition style cryptic clue. If an answer were posted with this explanation, I would happily accept it and put this old puzzle to rest!
For this simple puzzle, all you need to look at is the arrangement of the jewels. Everything else is flavour, including the aliens' high-tech grouting. A simplified image (which has all the information you need to solve the puzzle) may be found here (it is also annotated with the colours – red, yellow, orange – for anyone having trouble with reading them).