I read about it in Time magazine and have seen the puzzles in the New York Times.
The first when we did took us about 20 minutes… but after that we became pros
(well I became a pro we sat outside for 2 hours doing the puzzles and I won every time…)
The basis of the game is kind of like sudoko, but better.
On a 4 by 4 grid. You have to have 1-4 horizontally and vertically.
Each couple of squares is a simple math problem (i.e. 2-, 12x, etc.)
you figure out the math problem only by using number between 1-4. (i.e to get 2- it would be 4 and 2 or 3 and 1)