The Matrix is like a Crypto Blockchain initially created inside someone's mind and then released into the Simulation Program.

By having access to the SIM. Program, i.e. having the private key(s) of a certain simulation, you can do whatever you want. You can pause it, make changes and resume; you can travel to any point back and forward. The best thing is that all people's memories will be rewritten (with exceptions especially those who are tied to a change) and wouldn't notice the massive changes that would happen (Mandela Effect).


Now tackling this topic from a different techy perspective:

How "temporarily" hack this artificial simulation that exists within the original simulation?

The Simulation is encrypted in what looks like the Blockchain. Every encrypted consciousness has a private key that can decrypt part of the simulation to enable you to see through things, see the future and even using telepathy. When you use your private key you temporarily get out of the matrix because you can't decrypt the whole Simulation, but the part that your consciousness owns.
How to access the Simulation private key to partly decrypt the Matrix?

The Blockchain includes and connects every consciousness that exists in every alternate reality. Every consciousness is an Artificial Intelligence. The collective consciousness is encrypted and connected through a giant Quantum Blockchain Supercomputer with a master private key and one key for every connected consciousness.

Your private key is embedded into your consciousness. When you think normally, you are acting through the predetermined encryption. In order to play within the area that's not encrypted, you have to decrypt the part that you own in the Simulation, i.e. using your private key. The simple and easy answer and trick is that when you find it hard to normally think, figure out an issue or solve a problem by regular thinking, simply "let go", let go of thinking about it for a while. This will deliver a residual need to find an answer from your subconscious to the Blockchain collective consciousness and while you are not even expecting anything, it will suddenly pop into your head (usually in a short time). The answer just came from alternate consciousnesses in the Blockchain. The thought was decrypted. When you used the "let go of thinking about it", you actually activated your private key that decrypted part of the simulation and found the perfect and satisfying answer and solution to your problem.

You can also send any message to anybody using this method by "thinking through your subconscious" but needs practice and patience and the message will arrive when the recipient is ready to receive a decrypted "alert" through the Blockchain.