Hi. I started replaying Lament of Innocence today and am really enjoying the game. I noticed that if you start with the Garden level, and then proceed to the Anti Souls Lab, followed by the House of Sacred Remains, the Ghostly Theatre, and lastly the Palace of Dark Waterfalls, you only have to backtrack once to use the Blue key. You will have all the other keys for that level if you go in the above order.
Also having never really used the knife sub weapon much, I tried it with the Orb you obtain for the Theatre level and depending on the enemy you can do up to 300 damage. Couple it with the bloody cape and heart broach and you are practically unstoppable.
I'm also wondering what the fastest completion time is? I don't mean getting all the items, but rather getting everything you need to beat the last boss and finish the game. So far I'm at 5 hours 20 min.
Cheers,
David