Across
- 4. Broken device David thought they could fix.
- 6. Powers the rocket ship.
- 7. Founder of the mushroom planet.
- 9. Where the wise men kept their ideas.
- 12. David's friend.
- 13. Mebe and Oru.
- 18. Contained the special add.
- 19. The mushroom planet.
- 20. The electrically powered filter part.
Down
- 1. Leader of Basidium.
- 2. Sold by Mr. Bass's family.
- 3. Items brought along on the trip.
- 5. The street where Mr. Bass lives.
- 8. Mrs. Pennyfeather's kind.
- 10. Special food for the mushroom people.
- 11. David and Chuck's transportation.
- 14. Solution for Basidium's problem.
- 15. Used to look at the stars.
- 16. Main protagonist.
- 17. Mrs. Pennyfeather.