See how you stack up to some sophomore challenge riddles.

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Across
  1. 1. What has 13 hearts but no other organs?
  2. 4. What loses its head in the morning but gets it back at night?
  3. 7. What travels the world but stays in the corner
  4. 8. What stays in the water but doesn't get wet
Down
  1. 2. What five-letter word can be read the same upside down or right side up?
  2. 3. What word contains all of the twenty-six letters?
  3. 5. I am a solitary word, 5 letters long. Behead me once, I am the same. Behead me again, I am still the same.
  4. 6. The poor have me; the rich need me. Eat me and you will die. What am I?