Midfield can often be a difficult area to get through or bypass. You don't want to be booting the ball over the top because more often than not you will lose it. Pass through instead.
Keeping possession in tight areas of the pitch that get crowded needs players to make short accurate passes at a speed that makes it difficult for defenders to win.
Mark out the area and put a target goal on each side. You need two teams of 4 players plus two magic men. Teams attack two of the goals that are opposite each other – so one team attacks North and South goals and one team attack East and West goals.