Input systems for multiple gaming device displays, and related devices, systems, and methods, include a first display device, a second display device, an input device, a processor circuit, and a memory coupled to the processor circuit. The memory includes machine-readable instructions that, when executed by the processor circuit, cause the processor circuit to receive a first input value from the input device. Based on the first input value, the processor circuit causes the first display device to modify a first graphical interface element being displayed on the first display device to generate a first modified graphical interface element on the first display device, and cause the second display device to display a second graphical interface element based on the first modified graphical interface element.