From what I understand you're supposed to get the result (in your example 6) by combining the cells in that box with the given operator (in this case times). S

From what I understand you're supposed to get the result (in your example 6) by combining the cells in that box with the given operator (in this case times). So a "6x" box with two cells results in (1 and 6) or (2 and 3), since those are the only products that result in 6. Likewise, "7+" with three squares can only be (1, 2 and 4).