Eli5: How are leaks from video games found inside the game’s files before it’s even released?

Question

Eli5: How are leaks from video games found inside the game’s files before it’s even released?

In: 1

Answer 1

The simple answer is that some files and data will be included before the main update that enables all the functionality. For example, the graphical assets could be finished and deployed in an update you download before the other development with new functionality is ready to use them.