4 teams of 4 plus 2 neutral 6ers. Each team in a different colour, plus the 6ers in a 5th colour.
2 teams start as a back 4 with the other 2 as 2 strikers and 2 wide midfielders. The back 4 move the ball across the pitch (including the GK) looking to keep possession and find a forward pass to the 6.
After command from the coach (one whistle blow), possession switches to the attacking team, with the 6er now working as a central midfielder looking to combine with the 2 strikers and 2 wide players to keep possession. The back 4 are compact working on communication, marking, covering and keeping balance.
On a second command from the coach (eg 2 whistle blows) the team in possession immediately attacks the opposite goal. The defending teams must transition to defend the oncoming attacking team.