Abstract: To enable a TV set to be used for the so-called TV-games, that is the visualization of the several phases of a game, the improvement consists in providing a bistable switching means which, when it is in a first of two positions, enables the TV set to operate as usual for receiving and processing the antenna picked up signals, whereas, when the bistable switching means is in its other position, the tuning stage of the TV set is not fed and does not process the antenna signals, whereas the signal generator which provides the signals required for carrying out the TV game is now fed and, therewith, also the other circuits which are necessary to execute the audio and video functions. The circuitry portion relating to the TV game can be provided as a single, self-contained unit and provisions can be made for having it united into a module and the latter can be inserted into, or removed from, the TV set.