One player is selected and is blindfolded. They are then spun several times, the other players then move around the playarea, the blindfolded player can move to, but can"t grab anyone while people are moving, when they want to the blindfolded player calls out 'RED LIGHT' on hearing this everyone must stop moving, including the blindfolded player. They then try to grab someone, if they find someone, they have to identify them, if they are successful they swap places otherwise they let that person go. If they can"t identify or grab someone they call out 'GREEN LIGHT' and the players all move around again. They remain blindfolded until they find and identify someone.
Source: From the original site.(Submitted by: Heather)