4 x 4 grid
The first number is how many categories there are. For example, the price, the name, the city and the animal.
The second number is how many possibilities there are in each category. Four possible price points, four people, four cities, and four animals.
Each combination of categories will produce a 4 x 4 grid, such as:
.... Ben . Mia . Sam . Reb
$3  ___  ___  ___  ___ 
$5  ___  ___  ___  ___ 
$7  ___  ___  ___  ___ 
$9  ___  ___  ___  ___ 
The total solving area will have 3 of those grids in the top row, 2 in the second row and 1 in the last row.
