A game ball assembly for use with a game ball is described comprising a net for receiving and holding the game ball, a handle adapted to be retained within a user's hand, a length adjuster having a body part and a relatively movable locking slide part defining with said body part two paths at opposite sides of the slide part, and an elongated substantially inelastic tether cord or rope secured between the handle and the net. The tether extends through one of the paths of the length adjuster, through the net and then through the other path of the length adjuster such that a free end of the tether is supported between the slide part and the body part of the length adjuster. This arrangement facilitates simple adjustment of the length of the tether.