J.K. Rowling’s Pottermore site has started a competition to pick its first million users, who will receive early access to the site, reports the Los Angeles Times’ Technology blog.

Each day the website Pottermore.com will feature a new clue from the Harry Potter books, the piece notes. If the user answers it correctly, he or she will be directed to a partner website to search for the Magical Quill and then be allowed to register for Pottermore.

Sign-ups must be done quickly as only a certain number of early access accounts are available each day. The competition ends Saturday.