Not just any rpg though, I spent months deciphering this message and all of my other works into one super continuity and this one has become my life's work as a game designer.
This game has become extremely complicated to the point where I designed a program that could simulate a city of 10000 random people +fixed npcs + daily visiting npcs that calculates a ton of variables for each npc. Things like emotions, history, social interacts, things like heard the main character say something on the street and possibly thousands of other variables are calculated for each npc. The character is able to actively mind read low willed npcs as a primary gameplay function.
The plot is also calculated with as many variables as possible and gives you a ton of choice leaving the game to have a ton of endings and making no run the same. The combat system is heavily decided by all of this a well as it all effects your items stats and abilities depending on what you do during the plot. The game is designed so that when you die you go back to the start of the game but things related to your soul remain on your save file, each time you die you will be playing the game faster and faster because you know more about the game and are more skilled. I designed a high score system and fitted online multiplayer into the plot(i like to design competitive games btw).
Imagine being the first person to get the true ending, now imagine how hard it is to get right.