This is a flashback chapter and part of the story itself. In it, you play as one of two boys, and your goal is to chase your brother through the construction site. Be careful and pay close attention, as the mixture of commands will range from time-sensitive inputs, holding a set series of buttons together, or the simple ones that are presented to you for a simple command progression.
It will start with you chasing your brother out to the start of the construction site and end with you playing a game of hide and seek. The command prompts right before Hide and Seek are the important ones, so if you get to this point and have messed up on, maybe, a prompt where you have to climb up some bricks or take a jump, then you would do better if you went back to the Main Menu and tried again.
Addendum by Darth-Payload: "I just want to point out , that if you make a mistake you can quit to menu and select continue (Must have save enable) as many times as you like, instead of restarting level. Also the button prompts right at end where you are trying to pull your brother to safety do not matter if you fail."