ROM Hack Request: Simple (I think) save state hacking

[grafmons]

I'm brand n00b to hacking, so I was wondering if anyone could help me out with what seems like an easy hack for my Lego Star Wars II sav file. It's in my dropbox here: http://db.tt/bHJTban7

I found the "stud" (money) amount quite easily ("00 73 9b" @ address 105 and 10d), but I noticed that there is some kind of secondary value that needs to be changed when the stud amount changes ("e9 e6" @ a08). Not sure what it is, maybe a checksum?

I want to take it to 1,000,000 or so Since one can "buy" invincibility at that amount, I know it will be valid. Any help would be awesome. Thanks.

 

[grafmons]

Figured it out. Checksum changes by -2 multiplied by the money increase amount in 16 bit cycles.