How do you hijack/modify a game executable?

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I'm aware that hijacking is easily detected by code integrity checks, but there are plenty good games out there that don't have any code integrity checks or not any advanced check.

I've researched how to detect if the game has any basic code integrity checks, and I can explain how to do it if requested.

I'm just a beginner with IDA Pro and assembly (studying the book called "Practical Malware Analysis". but it doesn't teach everything and it's not so easy to find the information I need to learn from always.

So, I want to know how do I create a modified game executable to replace the original one?
I want the modified executable to have the hacks built into it (ESP) and the toggle-able hacked GUI.

I searched mpgh for threads that discuss hijacking but didn't find any about this topic.

I figured out how to do it, It was much simpler than I thought.
After you have done all the modifications to the executable in IDA Pro, you just click File > Produce > executable, that's it