Infinite ring use,ammo,health:
Infinite Ring:YBABYX
Infinite Ammo:XBYAXB
Infinite Health:YAXBAY

Moria:
When you reach the door of Moria,as gandalf, hit X against the door. it will ask which chant gandalf can say. pick "Mellon".

Walk fast while blocking:
To move fast while blocking, franticly press the B button. Yeah, sure it looks weird but on certain levels its a good idea

Getting past the 21st Hall:
To get past the 21st Hall in Moria, go to the platforms in the middle of the room. Stand on one of them then save the game. After you're done saving, load the game and walk off the platform. You'll see it stays down. Just do it again and again for each one and you can leave the level.