The birthday girl is blindfolded and spun around, all her guests then scatter. The birthday girl, then has to try to catch one of her guests. When she does, the guest leads the birthday girl (still blindfolded) to a chair. The guest then gives the birthday girl her present, the birthday girl then has to unwrap and try to guess what her present is. Once she has done this, she is led back to the play area and tries to catch another guest. The birthday girl remains blindfolded until she has caught all her guests.
Source: From the original site.(Submitted by: Sophie)