Each problem presents a 3 x 3 matrix of abstract designs with one empty cell ; the matrix is constructed according to a rule .
The person must find out the rule to determine which of 8 alternatives fits into the empty cell .
Each problem presents a 3 x 3 matrix of abstract designs with one empty cell ; the matrix is constructed according to a rule , and the person must find out the rule to determine which of 8 alternatives fits into the empty cell .