What kind of competition should I have? I want to give away 10 copies of my book, but how should I do it? (poll 8265523)

What kind of competition should I have? I want to give away 10 copies of my book, but how should I do it?

Randomly pick ten people from the phone book

Create a Jigsaw puzzle and the first 10 people to finish and post a selfie get a copy of the e-book

Create a crossword puzzle and give a copy of the e-book to 10 people who finish the crossword and share the link

Post about the competition and after 2 weeks, randomly pick 10 people who have shared the post and like my page and give them the e-book

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See this poll on: https://poll.fm/8265523/embed