Crossword clues for the word: CALVINBALL The word CALVINBALL has appeared as an answer to at least 4 crossword clues on different crossword puzzles. Crossword clues for CALVINBALL Showing 1 to 4 of 4 results Clue(s) Activity for Hobbes Fictional sport whose overly-complicated rules change as it is being played Fictional sport whose rules are invented during play Sport whose rules are invented during play and whose score may be "oogy to boogy," per Hobbes