How do I get in the castle (solution #1)

Hint 1 of 16:

Did you get the map from Wu?

Hint 2 of 16:

There's a sewer on the side of the castle.

Hint 3 of 16:

Go to the side of the castle.  Notice that sewer grate?

Hint 4 of 16:

You'll need to pry the grate off.

Hint 5 of 16:

Remember something from the plane that will help?

Hint 6 of 16:

That crowbar should do the trick.

Hint 7 of 16:

Wait until the guard has been off the screen for a while, though.

Hint 8 of 16:

Now, you need light inside the sewer.

Hint 9 of 16:

Notice anything that will do the trick?

Hint 10 of 16:

Lucky has something.

Hint 11 of 16:

Drop the lighter.  It will "follow" you and keep things lit.

Hint 12 of 16:

You'll have to get through the hole, too.

Hint 13 of 16:

That means enlarging it.

Hint 14 of 16:

Notice anything that could do the trick in the sewer?

Hint 15 of 16:

The changing cursor will give you a hint.

Hint 16 of 16:

There's a loose beam on the second sewer screen.  Use it on the hole.