Honkai: Star Rail features a ton of quests that you can complete to progress in the game and earn free rewards as well. One of them is Hide-and-Seek which is the subquest for the Trailblaze Mission; In The Withering Wintry Night, in which you will have to find hidden children. However, there are no specific directions for their locations and if you are unable to find them, here are the locations of all hidden children in the Hide-and-Seek game in Honkai: Star Rail.
Honkai Star Rail Hide-and-Seek: Find All Hidden Children & Win
First Hidden Child Location
The name of the first child you need to find is Hook, and to find her, go towards the South direction, and she will be hiding behind some crates on the left side.
Second Hidden Child Location
Turn around and go towards the North direction in the quest area, and then take a right. You will see the head of the second child, Moles Sidekick, who is hiding behind some crates.
Third Hidden Child Location
Go to the center of the intersection of three paths which is also the place you started the game from, and there you will spot a suspicious person there wearing spectacles. Go close to him and investigate to find out that he has a childish voice, and all you have to do is complete the dialogue to catch Julian.
After finding all three children, you will have to complete a dialogue with them and follow Hook to the Fight Club. Once you reach there, another dialogue with initiate with her, and you will have to finish it to complete the Hide-and-Seek quest.