Another way to keep duplicate posts down, is to title your post clearly.

For example, if you're having trouble with Puzzle 3, rather than posting, "plz help", you could title your post, "questions about puzzle 3".

The titles to the post are important and if you can give information in the title, it makes it easier to find information and easier to search for information.

It will also help keep the duplicate posts down and cut out a lot of work for the mods.