It is actually a kiss war:
Preferably on soft surface: grass. Everyone sitting in a circle (the sitting part is essential because it makes the game more difficult and fun). Girls a number whispered in their ear and boys get letters. One participant is sitting in the middle saying out loud one letter and one number.
If the person sitting in the center is a girl, the boy who heard his letter has to run and give the middle a kiss in the cheek. The with the number has to run and try to prevent the kiss from happening at all cost! In order to win the participant who wants to block the kiss has kiss the person with the opposite gender first. Sounds simple? Wanna try???