The third puzzle in the Black Dragon Trial is the single most difficult in the game, so don't feel bad if it stumped you. It takes a lot of surveying to discover the values for the doors and torches, and then some thinking on how to go about using that information to solve it. Below are the steps to successfully complete the puzzle:
1) Once you enter the room take the only open door.
2) Light the +3 and +5 torches inside, making 8.
3) Take the 8 door that just opened at the room top.
4) Light the +2 and +4 torches inside the room the tunnel took you to, making 14.
5) Exit the 14+ door that just opened at the room bottom.
6) Return to the first room you visited, the second door from the left.
7) Light the -1 and -6 torches, making 7.
8) Exit the room from the bottom and then enter the first door from the left.
9) Light the +10 torch in the room center and put out the -6 torch, which adds 6 and makes 23.
10) Enter the tunnel above that you just opened in the same room.
11) Light the -3 and -2 torches and exit the room from the bottom.
12) If you did the last step correctly the fourth door from the left should now be open and you must enter it.
13) Put out the +4 and +2 torches and light the -4 torch to make 8 and open the tunnel above, taking it back to the second room from the left.
14) Put out the +3 and +5 torches and then light the -6 torch, making -6 and opening the first door from the left.
15) Enter the now open first room from the left and put out the +10 torch, making -16 and solving the puzzle.
16) Take the now opened middle door and get the heck out of this dang room.
My focus with Everlong truly was making something fun while exploring what I could do with rm2k; it wasn't to tell a story, develop memorable characters, code complex custom systems, or show off eye candy. I'm also always looking for any feedback that helps me make the game more enjoyable.
You say you're not enjoying the random battles. What areas have too fequent or too few battles? Where did the fights become too challenging or hard? What causes the frustration? Too much damage being dealt, too many status effects, too many elemental attacks, not enough enemy weaknesses to exploit, monsters too fast or have too much HP?
There is a wide variety of monsters and formations (especially in the later dungeons) but quantity doesn't equal quality. Many people have said the random battles are easy, but then again they may not have played that far into the game. The more comments and suggestions you can give about the game the better I can make it for you and everybody.