Here's a list of a games that involve finding or sensing other people.  Hide and Seek is the classic.

Note that these categories are pretty fluid and there is a lot of overlap between different ones.  Where applicable I've cross-referenced similar games.

Come a little closer Ghost in the Graveyard Hide and Seek Hide the Button Lion's Cub Marco Polo No Ghosts Out Tonight Piggie wants a signal Punch the Icebox Red Light/Green Light Sardines Sharks And Minnows Spy The Blind Game