ROM Hack hello someone that can help to that I learn how to create program to edit save

reshiram1

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hi all I have a question Know someone who can teach me to learn to create a program to edit save any game nintendo 3ds and teach from 0% to 100% of this as the whole process is done and how studying the game to put it within the program edit save and then goes to save the game? hope you can help thank you all again in advance I hope your answers a greeting
 

NCDyson

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hi all I have a question Know someone who can teach me to learn to create a program to edit save any game nintendo 3ds and teach from 0% to 100% of this as the whole process is done and how studying the game to put it within the program edit save and then goes to save the game? hope you can help thank you all again in advance I hope your answers a greeting


It's not a simple task. You have to learn about many things, including programming, and the various types of data that are used by computers. On top of that, unless you study the game's code, you're going to end up doing a lot of trial and error, as well as making a small change in a game, saving, then checking the data again. It's not a topic someone can just teach you from 0% to 100%.
 
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SilverRegret

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Hooboy.. glad you're asking Luci, just as reshiram, i want to somehow edit my savedata, to be specific,
my Fire Emblem Awakening [us].sav,and monster hunter 3 ultimate [us].sav. GW .sav data,
and i got the extracted version from savedata filer,
anyone could help me analyze the save data structure?
cheers..
 

AHP_person

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Savedata structure isn't hard to figure out if you know what to look for. I'm not extremely gifted when it comes to things like programming, but dissecting files is easy.

The first thing you'd need is just a hex editor. You can easily find one with some quick google searches.
Then you can dump multiple savefiles after you do certain things. (e.g. buy an item, or beat a boss)
You can record changed bytes and bytes that correspond to the current save.

I have an example here: http://pastebin.com/5prmPDjH of when I tried to look through OOT savedata.

As for the editor, I suggest C# or VB on Visual Studio, google is your friend.
 
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daxtsu

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Savedata structure isn't hard to figure out if you know what to look for. I'm not extremely gifted when it comes to things like programming, but dissecting files is easy.

The first thing you'd need is just a hex editor. You can easily find one with some quick google searches.
Then you can dump multiple savefiles after you do certain things. (e.g. buy an item, or beat a boss)
You can record changed bytes and bytes that correspond to the current save.

I have an example here: http://pastebin.com/5prmPDjH of when I tried to look through OOT savedata.

As for the editor, I suggest C# or VB on Visual Studio, google is your friend.


Slightly off-topic, but if you were curious about OoT3D's save format, http://cloudmodding.com/zelda/oot3dsave can't be beat.
 
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reshiram1

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hi all the game that I want to edit with a program to edit save is youkai watch 2 honke,ganso and shinuchi hope you can help thank you all again in advance I await your response a greeting

I edit sorry for the delayed response
 

GHANMI

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Ni no Kuni DS had encrypted saves so I fear Youkai Watch 1/2 (which are based on the same engine) are probably following suit.
 

reshiram1

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Hello friend GHANMI in such a case if there was a way to enter the save or remove encryption that blocks the possibility of modifying the save to add items or characters so that it works thank you all again in advance and for the information and response a greeting
 

liomajor

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If its a one time job, trial and error is the fastest way to get results using HxD.

First you need to be clear what to search for. Money / EXP / Items and so on...

Increasing/Decreasing values are easy to spot, but the game can use
protection like crc to make sure the file is unchanged.

Make 2 saves with different values, decrypt both saves and compare them.
(A few games change offsets for each save slot > use the same slot, export step by step)

If you are lucky, the value is simple DEC > HEX and a fast hit.

Sometimes they count values different like 1 = 4 , 2 = 8,
a full compare might show more than one possible
results and testing is necessary.

Change value and import the save back to 3ds.

If the savegame is now corrupt, it might be protected > if not, gooood.

For Items, it can be tricky! A few games have more than one Byte
just counting it, there might be another Byte for picking it up yes/no.

At least this should be faster than to analyse the games code ;)
 

reshiram1

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hello of new friend liomajor I.e. on the save change only the numbers 1 = 4, 2 = 8 and with this we find money and exp and items? hope you can help liomajor thank you again in advance I hope your answer a greeting
 

liomajor

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I never played Youkai Watch nor looked into it.

That was only a short introduction how trial and error works with a few examples.

The rest is up to you ^_^
 

reshiram1

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hello of new friend liomajor I hope it does not li to the save I will try to test Have I draw from all this thanks to you for the brief as introducing short numeric codes with HxD thank you again in advance a greeting
 
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