[marmusman]

Call me a math geek, but I figured it out. They used a checksum based on 2^n (2 to the Nth power) where n=1 to 24 (there are 24 different difficulty parameters.) Each checked parameter is a different "n" number (2^n) added to (2^24)/24. If there is not a check, then the number is just (2^24)/24. Then all items are added together. So if no items are checked the number is (2^24)=16777216, since nothing is added. The only exception seems to be for when all items checked. It becomes 2x(2^24)-1=33554431


If anybody wants this useless info, I can make an Excel Spreadsheet for it. They didn't assign the "n" numbers in the order that the difficulty settings are presented on the screen.