In Kindergarten and Grade 1 I use Utopia to get students thinking about patterns. The first pattern I want to emphasize is that exactly one on the four utopian buildings is in each row and column. Some students even in these younger grades are capable of solving the puzzles, but need help orienting the cards and board and reading the numeric clues.
I like these physical puzzles for use in the classroom where collaboration in pairs is to be encouraged. Compared to excellent puzzle apps on mobile devices, all these physical puzzles are expensive, so the only reason to purchase them is because you believe in social problem solving. I do.