Cheat Engine

Zkima · How do I cheat? Reputation: 0 Joined: 27 May 2015 Posts: 7

First of all i say sorry for bad english.
Good, i lost 5 days of my life wondering about of what do it with my health.
I tried xor, i tried backtrace, i tried everything what has in any tutorial in every forum about cheat engine and nothing, i just wanna a light to clear my mind, a tip, something. Here go the image. At the attachment.

Geri · Moderator Reputation: 111 Joined: 05 Feb 2010 Posts: 5636

It doesn't hurt if you post more info, like codes which are accessing to the value etc.

Zkima · How do I cheat? Reputation: 0 Joined: 27 May 2015 Posts: 7

There.

atom0s · Posted: Wed May 27, 2015 4:31 pm Post subject:

It is using float instructions. Try editing the value as a float instead of 4 bytes.

Zkima · How do I cheat? Reputation: 0 Joined: 27 May 2015 Posts: 7

Still doesn't make sense.

Geri · Moderator Reputation: 111 Joined: 05 Feb 2010 Posts: 5636

Set a data breakpoint on the value and use break and trace. Then you will see the instructions after it's accessed. There are almost limitless ways to "encrypt" a value. It could be something as easy as x+1 or x*2 or it could be an encryption which takes up hundreds of lines.

Gniarf · Posted: Wed May 27, 2015 5:38 pm Post subject:

@Zkima: right click on your cheat entry->change record->type, and set to "float". Normally you'll see a ratio between 0 and 1 that expresses the percentage of your renaming health.

Otherwise here's a approximate formula:
Ratio=(health/max_health) as a float. (ex 380/580=0.6551724076)
Interpret ratio as an integer (ex 0.6551724076 gives 0x3F27B961=1059567969)
Approximate value in cheat engine (as 4 byte integer)=RatioAsInteger*1.2053061886 + 23983078. This gives me the correct value for 201 and 380 hp, and a value less than a percent off for 580 and 573.

Most likely that 1.2 is actually 1.0 and 23983078 is 0. I made my formula assuming your max health max 580.0 which may not be accurate... and then comes rounding errors when copy-pasting from my float<->integer converter.

EDIT: on second thought changing type to float won't work.
...And this multiply+add to a float seen as integer oddly reminds me of quake's fast invert square algorithm... I smell a logarithm somewhere...

Zkima · How do I cheat? Reputation: 0 Joined: 27 May 2015 Posts: 7

Gniarf · Posted: Wed May 27, 2015 10:14 pm Post subject:

Here's a more convenient but less accurate formula for HP:
set type to float, Hp in cheat engine=(Hp in game - 75)*1 000 000

As for how I determined the coefficients, I think this spreadsheet will explain it better than a lenghty post:

Zkima · How do I cheat? Reputation: 0 Joined: 27 May 2015 Posts: 7

I'll going to sleep tomorrow i see this.

Gniarf · Posted: Thu May 28, 2015 12:30 pm Post subject:

After entering the values from your 1st and 3rd screenshots into a spreadsheet, doing an XY plot and asking for a "power" trendline, I get a near perfect fit with:
CE_float=173000*(InGameValue^1.252829752)
or
InGameValue=(CE_float/173000)^(1/1.252829752)
"^" meaning "elevated to the power".

Zkima · How do I cheat? Reputation: 0 Joined: 27 May 2015 Posts: 7

Gniarf · Posted: Thu May 28, 2015 4:42 pm Post subject:

Zkima · How do I cheat? Reputation: 0 Joined: 27 May 2015 Posts: 7

@Gniarf

Guy i really glad of everythin you did to me, really. But you know if has some other way to do it? Like trace backing, breakpoint the value or what access this or another way for i understand it and do the formula with just one know number? Look i know the real total hp, the ce value total hp and i know the base address of current hp, but i don't know what to do with that, i'm really confused. Maybe if i learn some ASM codes i can handle it better?

Gniarf · Posted: Thu May 28, 2015 8:58 pm Post subject: