>shouldn't there be way to manipulate it?

that would be like asking if a rat can alter a maze they are forced to run through in a lab

if this is a simulation...we as a species are nowhere near to understand how to manipulate something of that magnitude
q

>would one have to know the source code?

considering the program is so infinite...it have a single source code would be impossible...therefore you would have to manipulate infinitely different types of code controlled by different entities at the same time