The coach on the first base side hits a ground ball to the first player in line at the shortstop position; that player fields the ball and throws to the player at third who must catch the ball and tag the bag then place the ball in the bucket.
The player that made the throw runs over to receive the next throw at third.
The player from third goes to the back of the line to take a turn fielding the ball.
If the ball is over thrown the player on third must run the ball down as the player that over through the ball covers the base as the other player throws the ball back.
The base must be tagged before the ball goes in the bucket and the coach cannot hit the next ball until the previous ball is in the bucket.
When all six balls are in the bucket. The player on third must run the bucket of balls back to the coach and pour them out in a neat pile. (I make a square in the dirt that the players must place all the balls into... neatness counts.)
The player must then run the bucket back to its spot (put a mark in the dirt.)
The first team done... wins!