MM got it in post #2.
In working out the puzzle, 0 vanished from #2's possibilities in an earlier form of the rules and I must have forgotten to return it. Sorry for the confusion.
I'm not quite sure that this "style" of puzzle belongs here or in the math/logic forum. It's sort of both. Anyway, the puzzle is simply the following image. Good luck!
And again, if you like this, please check out my current KickStarter campaign here.
Here's an easy-ish one...
This combination lock uses digits 0-9
-[?]-[?]-[?]-[?]-
1. The first digit is a prime number.
2. The second digit is not a factor of 12.
3. The third digit is greater than the second digit.
4. The fourth digit is one greater than another digit.
5. There is exactly one odd digit.
6. No two digits are the same.
What is twice the sum of the digits?
[great work gentlemen. I was using elements, too, but couldn't get anything to fit.]
Okay, so pulling these together we enter into the keypad..... ??
Perhaps the number of elements in each: 334453
psykomakia - it's a (misspelled) word that means the psychological battle for the soul between good and evil, as often depicted by a devil on one shoulder and an angel on the other.
and I'm in the central time zone.