U,U,D,D,L,R,L,R,B,A

most likely Peek-a-Boo, or outside either Tag or Hide and Seek, if not something like Mouse Trap or Candy Land for board games

If you’re asking about video games, Pong on some sort of Realistic/Tandy console system in the late 70s when I would go to work with my father at Radio Shack (back when it was legit) and he would put me in front of the black&white.