A green simulation apparatus having a configurable upper surface with a changeable contour may comprise a covering forming the upper surface and a covering support assembly configured to support the covering. The support assembly may comprise a plurality of movable positioning elements having the covering resting thereon and positioned in an array extending in a reference plane and movable along axes extending substantially perpendicular to the reference plane. The support assembly may comprise a movement actuator configured to move at least one of the positioning elements independently of other positioning elements in the array. The plurality of positioning elements may include active positioning elements and passive positioning elements, with the active positioning elements being associated with a movement actuator and the passive positioning elements not being associated with a movement actuator.