Despite the common assumption that robots should improve performance, the effect of robotic assistance on game score depends on the format of the human–robot interaction. Shared coverage control is the only assistance paradigm that simultaneously reduces human operations, improves cognitive availability, and improves decision-making, while incorporating the participant’s intent, explaining its advantage. The area of each shape is equal, and the relative width corresponds to the number of trials that resulted in a particular game score. The dotted lines indicate the quartiles of the distribution. “n.s.” indicates no statistical significance.