Treasure Box Quest - Clues

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Across
  1. 4. box
  2. 8. best in daylight
  3. 9. Corner
  4. 11. Keyword for the ___
  5. 13. Knows the keyword
  6. 15. Easy Peasy _____ Sweezy is wrong
  7. 17. Sugar ____ fairy
  8. 18. No better support
Down
  1. 1. Fun with GPS and ___
  2. 2. Pyrimidine cytosine's purine
  3. 3. A _______ cipher
  4. 4. Dirk can illuminate us
  5. 5. Where ends with ____
  6. 6. Where starts with a base ____
  7. 7. A for Adenine
  8. 10. Log __ for pun
  9. 12. gramana
  10. 14. Great month for the botanical garden
  11. 16. Pay to upgrade?