We are pleased to announce our second crossword competition. Be assured, this one is a lot harder than the first.

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The competition will run for one month (ending September 18). At the end of the month, the answers will be posted here, and all correct entries will be added to a draw. One random entry will be selected as the winner – so every correct submission has a chance.

You have three options for downloading or filling in the puzzle:

1) Download the PDF document

If you don’t know how to read a PDF, you need to download a copy of a PDF viewer – it is completely free and you can download it here. You can either fill in the PDF with PDF writing software or you can just write the answers in an email to me.

2) Download the JPG

We have now published the list as a JPG image. You can download this and use a graphics program to fill in the answers and send it in, or you can write the answers in an email and send them to me.

3) Fill in the answers on the web

We have a very easy to use web interface for the crossword. Please be sure to print off the final answers once you have filled them in as the web interface doesn’t save the answers and doesn’t send them to me. You need to print the answers and email them to me. This option also lets you check 5 of your answers to see if they are correct. To print the answers at the end, select the “Game” menu and click “Print”.

Please remember not to use the comments here to cheat – do not tell anyone else the answers. You can, however, use the comments to discuss your progress, to tell people which ones you are finding toughest, and to comment in general on the idea of a regular crossword competition.

The prize for the competition is your choice of either a tee-shirt, a mug, or a cap from the List Universe Store.

When you have completed your puzzle, send your answers to crossword@listverse.com

Remember, the deadline for entries is September 18th at 1:00am GMT.