Players work in pairs. Each pair has a number or sign.
In this case 8 pairs are involved into this 1v1 game.
Cones, sticks and goals are placed as shown to mark the players' positions and the playing area. Two pairs have the same sign and they replace each other continuously.
One player of the pair holds a ball.
After a pair called by the coach and they left the area, the same signed pair replaces them as soon as possible and start their passing quickly to be ready for a 1v1 situation.

The coach calls the pairs continuously in unregulated way while they are passing their ball to each other.
Players in the pair must react quickly. The outside player is the attacker, the other player inside defends the middle zone and tries to win the ball. The outside player tries to beat the defender in a 1v1 situation and dribble inside the area strictly between the sticks in front.
When the defender wins the ball he can score to the goal behind the attacker.