My sons have puzzles that consist of 91 coloured tiles in a different coloured columns. Each column has in one case a different set of addition fact (question on one side and answer on the other) or on the other puzzle multiplication tables. They are nice to look at and handle and you can see the patterns you might otherwise miss. I got them in NZ but i saw a link for a similar (10*10 instead of 9*9) at amazon.

Also the think fun stuff.