A contourable putting green ideally suited for use in indoor golf games including a contourable platform having an upper putting surface thereon and secured by tensioned springs to a parallel series of spaced, pivotally interconnected movable beams pivotally connected intermediate their ends to stationary beam support members. Motor driven self-reversing hydraulic jacks move the beams differentially to distort the platform and thereby vary the contour of the green. An electronic control circuit is provided for each jack, including an RC timer circuit having a discrete time constant, and is arranged so that operation of all of the jacks is simultaneously initiated by a master control switch, yet the operation of each jack continues to operate independently over its discrete period of time; resulting in unsynchronized movement of the various portions of the platform and a putting surface of substantially random contour.