Cheat Engine

[h3x1c]

[Gniarf]

Rydian's version of gamemaker is quite different from what I'm used to see, for example the ID at variable+0x10 aren't present so I guess we might have to restart from scratch for the next gamemaker version.

For now I'm going to focus on h3x1c's version, since it matches what I see in games atm.
In this version the string "getting variable oind=%d, varind=%d, arrind=%d - global=%08x(%d)(%d)" is present, referenced at CheatEngineSmallGame.exe+1185D1 and used if you set (byte)CheatEngineSmallGame.exe+5313BA to 1.
Health has varind=100000 (dec) and money 100001 so at least we now know that varind isn't hash-derived.
Does this 100000 have any correspondence in the editor, or is there an upper limit to the number of global variables?

I'd like to investigate the oind, arrind, and global stuff, so h3x1c, could you create a game like that:?
-2 classes (player and enemy) that do not inherit from each other.
-Player has health and money members, the enemy has level and health (declared in that order incase it matters).
-One instance of the player and 2 enemies, with buttons to change each member variable (just increasing is enough).
-Icing on the cake: one global variable plz (let's see if it has varind<100k).

[Rydian]

Is it both versions or just the YYC that's different? The YYC version is supposedly compiled scripts and needed VS2012 to generate (which is why it was slower for me to post since god forbid an initial installer for something actually include the latest updates).

Then again I use the early access branch for testing things (it's quicker to adapt to library changes and junk) and it's hard to find an updated list of the actual differences.

[AJarOfLube]

Dang, GMS was on sale in an indie bundle a few weeks ago, I wish I had bought it now.

If anyone is interested, there is someone on SteamTrades dot com selling it for 18 keys (about $45), just search for "Play and Create with GameMaker"

[Gniarf]

@Rydian: Both versions. Typically you have the varind (in the 100k+ range) 0x10 bytes after the double value, and I don't see it in the early access GMS, which puts zeroes there most of the time (also got junk(?) and a BAADB00B, ahem).
Looking up the stack (on the reader function) it would seem that local custom variable has varind 100002=186A2 (non-yyc ver), but I don't see it anywhere near the value itself.
On the yyc I don't see anything that looks like a varind on the stack.

BTW: there is stringref to "global variable %s(%d, %d) not set before reading it" at Hack Test(non-yyc).exe+10BF0F which is very close to the opcode that reads global variables. If we could grab that %s we should be able to do interesting stuff... with the globals.

[FragrantRegard]

I've been working with Spelunky to moderate success, actually, even despite my previous unfamiliarity with RAM editing, assembly, etc.

I found the line that sets initial HP, bombs, and rope, and created an autoassembler script to set it to a high value.

In Spelunky, whenever you save a damsel in a level and complete it, the health variable is incremented. I would modify it if I knew how to replace inc [eax] to addition without it breaking everything.

I've tried Risk of Rain, but it seems a lot of the variables are difficult to work with in the scan or otherwise unintuitive.

[pepsifresh]

I spent my morning and made a tiny game with enemy zombies with money drops, two global variables, and a player with common local variables.

Because of my new status I cannot seem to attach files or post links to downloads, so if anyone is interested just pm me.

I would really love to see a solution to GameMaker Studio games before GameMaker Studio 2 comes out (as it's already in beta).

[Creator256]