such unit in a manner well known in the art may cause a crash sound to occur and also a score change for the game video lines 13 and 15 are also connected to a video summer 22 which drives a color television display although in this embodiment the manually actuated car is red this is immaterial to the operation of the coincidence circuit since the manual object is on a blank background the presence of any video signal will indicate the manual object is being displayed at a certain location moreover in a first person situation where no car is actually displayed i e it appears to the player that he is physically in his car the effective manual object could be an unseen spot representing the unseen body of the driver 39 s car unique feature sensor 14 is shown in one embodiment of the invention in greater detail in fig2 and includes a color demodulator 23 for sensing the green cars represented by the video signal on line 13 such color demodulator is of the standard type used in tv receivers as for example the integrated circuit model lm746 available from national semiconductor corporation it has red blue and green outputs all of which are processed by a threshold circuit 24 this is necessary since a color signal may consist of varying amounts of red blue and green and thus if a green car were produced on a white background it would be necessary to distinguish from the green color component of the white background in any case the.