eli5: How do gamers figure out long cheat codes?

Question

eli5: How do gamers figure out long cheat codes?

In: 720

Answer 1

The three most common methods are

1) The developer intentionally tells people, either just literally their friends or publicly.

2) The gamers can “read” the games code and “find” them.

3) The cheat codes are repeating inside jokes like the Konami Code or “There is no cow level”