things that a hard to find

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Across
  1. 2. someone in a book that everyone tries to find and has a w in his name
  2. 4. Flying mammal
  3. 6. Have a roof and a door
Down
  1. 1. it is sticky
  2. 2. war 2 one of the worst wars in the 20th century
  3. 3. book you read it
  4. 5. can go to space