Request: Simple (I think) save state hacking

Discussion in 'GBA - Game Development, ROM Hacks and Translations' started by grafmons, Mar 14, 2012.

Mar 14, 2012
  1. grafmons
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    Newcomer grafmons Newbie

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    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.
     
  2. grafmons
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    Newcomer grafmons Newbie

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

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