I want to make it so players get given a secret code if they win the game, which gives them access to a special segment. But how do I stop people from just being able to See Inside and see the code prematurely?

without using any illegal methods, you can generate the code based on the username, like change it into numbers and probably encrypt it further, so that it's different for everyone

oh yeah that sounds good, would you be able to tell me how to convert words/usernames into number format? or does it require complex setup