After re-entering the Animus, you will step into the shoes of a young Connor. Chase the other kids until you start playing hide and seek.
Optional objective: Find all the children without making a mistake.
Optional objective: Find all the children within the given time - 4:00.
Optional objective: Completed all the constraints in one playthrough.
Your mission will be finding four of your friends who have hidden in the woods. Optional objectives require you to do it within four minutes and without any mistakes. With the countdown over, examine the nearest trace with the interaction button.
That will cause green circles inside of which the children have hidden to appear on the map.
Start off by heading to the middle of the left circle and examining the traces there. The circle will narrow.
The first child can be found in the pile of leaves in the middle of the area.
Now run to the middle of the nearest circle and examine the traces there. Inside the narrowed zone you will find further traces which will lead you to two hideouts.
The proper one is the one on the right (the greener one).
The last child is hiding behind a rock inside the third circle. Just go around it and you will complete the mission.
In the second part of the game, you will have to hide from a friend. All the hideouts will be marked on your map, though you should choose the nearest ones as they are already occupied. The time limit should be enough to reach even the furthest pile of leaves.
After hiding, a cutscene will play after which you will have to return to your village.
Get behind the palisade and head towards the green marker, avoiding any obstacles with the interaction button.
After getting to your house, approach it from the right and try saving your mother.
The mission will eventually come to an end.