Invisiclues

Where is the opal?

1. Have you solved the London Bridge riddle?
2. It's in the clump of moss under London Bridge.

How do I get the opal?

1. Can you lower the bridge?
2. Can you raise the water?
3. Wait for high tide.
4. The newspaper that came with your game contains the tide tables for the weekend.

Where is the zorkmid?

1. It's in the... oops. Sorry. Wrong game.

How do I get the zorkmid?

1. Buy Zork I.
2. Buy Enchanter.
3. Buy Sorcerer.
4. You get the idea.

Where is the topaz?

1. In a safety deposit box in the Bank of England.
2. Have you solved the number riddle?
3. It's in box 600.

How do I get the topaz?

1. See the clues for the Bank of England.

Where is the garnet?

1. Did you solve the Tower of London riddle?
2. It's in the butt of malmsey in the Bowyer Tower.

How do I get the garnet?

1. Have you tried drinking the wine?
2. Pretty tasty stuff, isn't it?
3. You need to drain the keg somehow.
4. You need to remove the bung.
5. Knock out the bung with the mace.
6. Don't read the next clue until you have done all of the above.
7. Ask Wiggins to get the garnet for you.

Why are the gems important?

1. You don't think the thief has been hiding gems all over London just for the fun of it, do you?
2. Perhaps he is trying to send Sherlock yet another message.
3. Have you looked at any of the gems?
4. Have you looked at any of them closely?
5. Look at each of the gems through the magnifying glass.