This is a set of two printable puzzles that I have upper elementary students work on in cooperative groups of 2-4 when I feel they need social time but with a structured purpose. Each takes about 15 minutes for the quickest group to finish and 20 for most groups. Both are language-based; one is logic and the other is vocabulary. Included at the end of the document is a link to a very cool website that helps you make more puzzles of your own like the second one.
These can also be used individually with a class. Answers are provided for both puzzles.