Abstract: A portable interactive game unit including a housing at least partially enclosing a power supply, a feedback generator for providing at least one of an auditory feedback signal, a tactile feedback signal and a visual feedback signal, a controller including at least a processor and a memory for storing at least a representation of a game scenario, and a wireless inter-device communication module for communicating with another game unit, wherein in operation the processor calculates at least one game parameter based on a signal of the wireless inter-device communication module using the representation of the game scenario and a performance dependent parameter.