Aliens have escaped from a book and
stolen the Dewey Decimal numbers from the spine labels of other books! Without the numbers, no one knows how to find anything or where to put the books 
back...it will be a disaster! You know the
librarian will return in 45 minutes, can you solve all five puzzles, defeat the aliens,and get the numbers back on the books before they return?

This program is for ages 15+