Firstly, this game has unique gameplay and you may wonder, “Why isn’t the game starting” as you toggle through the characters. This is because the game has already started and you can freely move any of the seven characters. Taking three into the cave will lock your character set to those three.
While this game allows you to skip certain puzzles based on the players you choose, I am going to always assume you have to solve the puzzle the long way.
Start by heading right and grabbing the Crowbar with O/B and then go left and use it (Square/Y) to pry your way through to the Shoddy Barricade . Follow the path until you are unable to jump up and over a high ledge and find the nearby box to the right, which you can grab and push/pull by holding Square/Y. Pick three characters and stand them on the bridge to proceed.