A device for putting a golf ball. In one embodiment, the device comprises a base having an elongated side defining a base line, a first and second shoulder attached to the base, and a guide member pivotly attached to the first and second shoulders. The guide member has a top surface, and the guide member contains an elongated side defining a shaft line that is parallel with the base line of the base. The top surface also has a slotted opening that defines a practice line that is parallel with the base line of the base and the shaft line of the guide member. In one embodiment, the slotted opening has a variable top. Also, the device may include a laser and a target reflector, and wherein the laser beam is parallel with the base line, shaft line, and practice line.