Hide a valentine with only part of it exposed.
Paper valentine with a string attached
Staple a 2" piece of string to a heart cut out of posterboard or construction paper. Hide the heart while all players close their eyes. The Valentine maybe covered but the string must be left exposed and visible. Tell the players to search for the Valentine, but when they find it they should not pick it up or tell anyone. Instead they must just go and sit back down and say "Hearts Unhjd!" Then they wait until everyone else has found it. The first player to sit down then may hide the heart.