The Collaborative International Dictionary of English v.0.48:

hide-and-seek \hide-and-seek\, hide and go seek \hide and go
seek\n.
   A game played by children, in which one child (who is "it")
   covers his eyes for a short time while the other players
   hide, and then the one who is "it" tries to find the others.
   [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

hide and go seek
    n 1: a game in which a child covers his eyes while the other
         players hide then tries to find them [syn: hide-and-seek,
         hide and go seek]