light indicators switch 12 is used to remove power from the electronic circuits when the device is not being used push button 60 is used to place a high condition on the reset line as shown the credible light set 13 is preferably composed of three leds led 42 for the first round led 43 for the second round and led 44 for the third round similarly the set of forget it lamps 15 are leds 45 for round 1 46 for round 2 and 47 for round 3 each lamp is controlled from its respective flip flop for example flip flop 36 controls lamp 32 causing it to light when flip flop 36 has a high level on its q output the indicator light control flip flops 36 41 are set through interlocking logic elements in accordance with the buttons pressed by the listener and the speaker during the game the speaker push button 18 for truth and 20 for amost truth operates flip flop 21 and 22 respectively the listener push buttons 22 for believe and 24 for almost believe operate flip flop 23 and 24 respectively a typical sequence of operations which causes credible led 42 to light is as follows the speaker presses truth button 18 indicative of his speaking the truth a high level is applied to the set input s at flip flop 21 causing it to switch thereby placing a high on the q output this high represents an enable signal to and gate 25 assume that the listener believes the speaker is telling the truth and depresses push button 22 this sets flip flop 23 causing a high on its q line to the other.