A variable interface putter golf club includes a golf club having a shaft with a club head affixed to a first end of the shaft that is distil from a second end of the shaft to be gripped by a golfer. A multi-sided rotatable carousel is contained substantially within the club head of the golf club, the multi-sided rotatable carousel having a putter face on a plurality of sides of the multi-sided rotating carousel. The multi-side rotating carousel preferably is shaped as a pentagon with a different putter face on each of the five sides of the pentagon. A device is included for permitting rotation of the multi-sided rotatable carousel for exposing one putter face of the plurality of putter faces at a given time for allowing the golfer to putt with the one putter face so exposed. A securing device, such as a securing screw, is used for preventing unwanted rotation of the multi-sided rotatable carousel so that only one putter face is exposed at a given time and that the selected putter face is secured in place during play. An optional analyzer device is included which aids the golfer in selecting the appropriate putter face for the conditions of a putter green at a given time. The optional analyzer device may also be used for other types of golf clubs and attached to portion of a golf club other than the shaft.