We describe the design and implementation of Arcade+, a custom-built arcade machine augmented with modern input devices to deploy and evaluate novel multi-modal interaction techniques for gaming. Arcade+ has gaze, feet, mid-air gestures, and multi touch sensing capabilities, as well as traditional arcade controls. Our modular design also allows for extending current capabilities or replacing them with others. To demonstrate the system's capabilities, we describe and discuss three games that explore how multi-modal input can inspire new play concepts and mechanics.