So I dug into the Advanced Mode the past few days and have found some things.
=> First off, your current Gil amount is located at
00034E54, as shown in the picture below.
So you can see where I highlighted the 0A 03, which is 778.
Remember: Hex values are in your file in reverse, so when you punch 778 into a calculator, it will give you 03 0A, so just reverse it and you're set. Now, instead of using the Quick Mode Max Gil code and getting the Save Wizard standard default 999,999,999 amount of Gil, I just went for 50,000 to give myself a good early boost. So the Hex value for 50,000 is 50 C3, and I changed the 0A 03 to 50 C3, and as shown below, I now had 50,000 Gil to play with. Note: The Gil number you enter can be four values long, and won't go past the 999,999,999 (FF C9 9A 3B) that the Max Gil Quick Code gives you, so you could easily go for 1,000,000 or 5,000,000 or whatever.
=> Next up, I wanted to look at Levels and EXP, and luckily enough, all of your characters info is basically right at the beginning of your file. The two pictures below will show the layouts for the five available characters in this first part of the game, each of them I highlighted by different colors.
Each character has four rows of information, and is broken down in color by the following:
-Cloud (Light Green, location 0x030 through 0x060)
-Barret (Light Yellow, location 0x070 through 0x0A0)
-Tifa (Light Blue, location 0x0B0 through 0x0E0)
-Aerith (Light Purple, location 0x0F0 through 0x120)
-Red XIII (Light Orange, location 0x130 through 0x160)
Let's look at Cloud then. The only two items that you can change are his Level (represented by the 0A) and his total gained XP (represented by the 0E 08). As you can see, Cloud is currently Level 10 (0A) and has gained 2,062 XP thus far in the game (0E 08).
That's where some confusion might set in, because in the game, all you can see is his current XP and the value you need to hit to gain another level, like 380/750 perhaps. So in this particular case, if you want to just gain one level up to 11, and in game you're sitting at 380/750, the difference in those two numbers is 370. Add that 370 to the 2,062 that your file shows that you have earned thus far, and the new number you want is 2,432, which in Hex, is 80 09. So change the 0E 08 to 80 09, fight one battle in game, and voila, you'll be at Level 11.
Of course, this also works if you want to plug in a much bigger number. Like above with the gil, say you want to have 50,000 XP. Change that 0E 08 to 50 C3, and when you load your game, it will show your EXP as 50000/750. So just go and fight one battle, and all that EXP will accumulate and you'll jump from Level 10 to a much higher level. I'm not sure what the Level breakdown cap for each individual level is, at some point I might get around to tracking it and doing the math, but we'll see.
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-On a side note, most of your characters stats and vitals are all listed here too. Those are all unfortunately locked at this time (maybe they'll get unlocked once the second or third part get released), but if you're curious, looking at Cloud again, you can see the following stats:
=> First Row (0x030): The 0F is his Speed
=> Second Row (0x040): The 51 03 is his Current HP, the C2 04 is his Current Max HP, the 20 is his Current MP, the 21 is his Current Max MP
=> Third Row (0x050): The 42 is his Attack, the 40 is his Magic Attack
=> Fourth Row (0x060): The first 20 is his Defense, the second 20 is his Magic Defense, and the 16 is his Luck
A little further down in the file (starting at 0x230) are the rest of the stats, as shown in the picture below.
Again, with Cloud's color being the Light Green, the four numbers in that row represent the following:
=> The 16 is his Strength, the 15 is his Magic, the first 10 is his Vitality, and the second 10 is his Spirit.
Hopefully we'll get to come back and spend some time messing around with those values in the future when/if they get unlocked, so I'll come back to that when/if necessary.