Answer:
The whole Palace complex, includin the gardens, can be used as the setting for an open-world videogame in which you are an anti-monarchy revolutionary who has the task of defeating the king.
As you progress through the game, you would encounter new enemies associated with the monarchy: from simple guards to trusted knights, to the nobles themselves.
The idea is very simple but could work out pretty well, and it a way, it takes alot after the Assassin Creed's series.