Allied to the ordinary crossword puzzle, and often found in crossword puzzle magazines, is a type of puzzle known as "Kriss Kross." Essentially, it consists of a blank diagram of interlocking letter paths, and a word list representing some particular category, such as trees, birds, or cities. The number of words on the list exactly equals the number of words required to fill the blank diagram, and it is the solver's problem to insert the words into the diagram in such a fashion that they interlock correctly, with the entire word list being used and the diagram being filled completely.
Lee, Edward L.
"Kriss Kross Kraft,"
Word Ways: Vol. 1
, Article 14.
Available at: https://digitalcommons.butler.edu/wordways/vol1/iss1/14