I played the boss fight level on Fatal Frame II like 18 times before I beat it. There were no cheats for beating the boss. It was one of those the-boss-touches-you-once-and-you-die type of things.
Plus, before you got to the finale, you had to run through this mile-long pathway filled with ghosts. There was no quick-save feature, and the last save-point was before that effing pathway. So by the 6th time playing the level, I knew every turn of that stupid pathway blindfolded.