To read the secret guide, you must enter "Annax" exactly as follows.
Once you enter the password, you can view maps of the game's locations. This will show you the multiple paths you can take and where to find each dragon. It doesn't tell you how to get through any of the areas or what you should do but merely shows you the pathways. If I manage to figure out two last puzzles, I'll write a guide, but for the moment I haven't reached 100% myself!