Game Description: Stack-Up (5-screw only) is a puzzle-based game designed for use with R.O.B. (Robotic Operating Buddy). Players must guide R.O.B. to move colored blocks into specific positions by executing commands given through the NES controller. The game features different modes, including a challenge mode where players must arrange blocks quickly. Stack-Up is one of the few NES titles designed specifically for R.O.B.