Super duper really difficult crossword puzzle made by a YouTuber

123456789101112131415161718
Across
  1. 3. City in Italy, flooded streets
  2. 5. Childhood memories
  3. 6. Capital of Morroco
  4. 9. You've committed this crime before
  5. 12. A real friend would _______
  6. 14. Capital of North Dakota
  7. 15. Danish toy brand
  8. 18. Original name of popular Swedish sandbox game
Down
  1. 1. Famous white jazz musician
  2. 2. Director of Napoleon Dynamite
  3. 4. Tacocat spelled backwards
  4. 7. Ocean on the east coast of USA
  5. 8. Simpson's character, always drunk
  6. 10. Microsoft owns this brand
  7. 11. First book of the bible
  8. 13. Texas metal band
  9. 16. American theoretical physicist
  10. 17. Soviet union, "treaty of ______"
  11. 18. Famous three stooges character