Some video games have unlocks when using special codes not used specifically for cheating but for unlocking certain secrets within the game itself. For example I need to enter a cheat code into my The Sims 3 game in order to be able to build certain kinds of structures and parks that you only can do that through entering at least 2 cheat codes. The game don't let you have access to all the build and buy features the game has to offer. unless, you enter this code unto a command prompt you need to access by pressing CTRL & SHIFT & C keys on the PC keyboard and typing a build cheat
(the sims 3 cheats for PC only)https://www.carls-sims-3-guide.com/cheats.php(to enabled most hidden features in the Sims 3 for PC)
"testingcheatsenabled true"
than after that type
"buydebug on"
"True Crimes Streets Of LA" has hidden playable characters as a good example on GameCube, PlayStation 2 and also Old Xbox
PS2 Only cheats for "True Crimes Streets Of LA" there is a special code to play as Snoop Dogg the Rapper
(list of cheats both to cheat and to unlock)
https://gamefaqs.gamespot.com/ps2/561383-true-crime-streets-of-la/cheatsCan you think and post of a game that has special cheats in order to enhance the game experience?