Guestbook

So I need to get the Open Door spell off the Werewolf, then use the Time Spell to go back and use the Open Door Spell somewhere before I would meet the Werewolf?

I'm clueless as to which door. I have blue, red, silver, platinum and crystal keys - which seem to open all the doors I've found. I can't be arsed with a trial and error approach to every single door - it would be better if there was a clue in the book somewhere, otherwise it's just a random case of using a spell at every location. Where's the fun in that?

So please, could somebody give a clue about what to do once you've used the Time Spell and gone back to the beginning.

Where are the Rusty Gauntlets? Elsewhere in the Guestbook, someone says they're with the Shadow Hunter. But I can't find him either.

It's right there in the text. There's nothing hidden. Just use the Time Spell at the acid river and read the text as it's presented to you.
You'll kick yourself when you find it, it's so obvious.

You are looking for a door that you have already seen but were unable to open. It is not hidden, it is described clearly in the text. I'll give you a clue - you don't need to go all the way through the dungeon to find it.

You will have to use the Reveal Invisible spell at a certain area in the adventure. The area in question is unusual in that it doesn't seem to have a purpose.

It is in the pool of acid guarded by the Giant Centipede

It's on top of the giant wall

There are clues here and there but they might be difficult to spot. The Cyclops give you some quite obvious ones though

I know it's not the Eye Ring, nor the Cats Claws (even with the Ninja Headband to complete the outfit)

You need the cat's claws and the spiked boots.

They only give you clues if you use a certain item at the location you meet them. You have mentioned this item.