Hollow Knight: Silksong is full of clever little secrets that can help you survive the brutal journey through Pharloom, whether it's a shortcut that skips major sections of the map or a hidden tool.
Some secrets, however, would probably be better off if they stayed that way. According to YouTuber Kilroy Was Here, there is apparently a specific set of speedrunning tricks you can perform that will lock protagonist Hornet in jail with no escape and no way to continue the game.
