A mechanical projector for use with an existing table bowling game allows players a choice of speeds at which a projectile is launched along a lane towards a target. This launcher may comprise a relatively soft speed-up roller rotatable about an axis transverse to the lane. Preferred versions of the projector have a ball-clearing mechanism that moves a returning ball, rolling from the target zone toward the player, off to one side of the alley so that the returning ball can bypass the projector and be returned to the player. In addition, a preferred version of the projector may be moved out of its normal operating position to allow for conventional unassisted play.