Peekaboo is a classic game that is not only good fun but is also a great way to teach object permanence and attention skills and to potentially reduce separation anxiety.
Check out some fun examples:
Early on: Mom moves the cloth
Then baby moves the cloth.
Fun with patterns: This grandma is teaching beginning patterns by popping out from one side to the other.
Ask children get more skilled with peekaboo, they can start to play Hide and Seek!