RUGBY SEVENS HONG KONG 7S Rugby Sevens in Contrast For many true rugby fans and enthusiasts, rugby sevens is a cheap imitation of the real thing. rugby sevens is also known as Rugby 7s and sometimes in rugby circles just simply as 7s. The contrast between rugby sevens and the regular rugby game is really focussed on two primary differences. The first being the most obvious is the number of players in rugby sevens is obviously seven which is where it gets its name from, while regular rugby is played with 15 men. IN regular play and in early round of tournaments rugby sevens is played in seven minute halfs unlike rugby which has forty minute halfs.