system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How are glitches/exploits/secrets found in video games, surely people don't spend hours and hours trying to find them with only a small chance there's actually something to find?
gpt
That’s exactly how they are found, that and dumb luck.  

The larger / more game breaking ones are usually found in the QA process which is literally doing repetitive motions over and over and over.   A few test cases might be something simple like 

Jump over the box 50 times.   Or there might be jump over the box 50 times while unsheathing your weapon mid air and spinning your camera around.