I have been looking for this one for years, but I remember so little it is hard to find. I don't even remember the platform, I think it was a very low memory system (4KB or 16KB RAM) and I could swear it worked with cartridges.
However, I remember a few things about the game. You are moving in a multilevel labyrinth, it is seen in 3D from your eyes. Turn based: you advance, or rotate 90 degrees. There are monsters in it, I thing they were dragons. You find weapons while you move, and when you reach a dragon, by turns you are asked which weapon you throw at him. I seem to remember that the color (both for weapons and dragons) indicated how strong they were, white being the hardest. Sometimes you found stairs so you could climb to the next level.
This is pretty much all I can remember. Rings a bell, anyone??