Hints:- 

Defeating Belezar:-  Place the Dragon Eye on the false Staff of Ages. 

Defeating the Warlock Lord:-  Place the Staff Of Ages followed by the Ring Of The Kingdom in the hands of the Lord Jair statue. 

Passing the fourth trial:-  Collect all three rings from the Inner Chamber of Tower 2. Equip the blue ring during the maze in the fourth trial to reset the controls to normal. Go through the maze and remove the ring after you exit. 

Finding the Rusty Key:-  Look between the column and the wall in the room with the custodian's note to find the Rusty Key. 

Gameshark Codes

Non-Expansion Enable Code ff1e00000000 
Enable Code (Must Be On) f109d5502400 
Have All Items 500024020202   810ec3500001   500046010000   800ec3d10003