Proper grounding of the metal case will ensure that the electromagnetic emissions which are produced by tube-lights and electronic ballasts etc (which lie within the bandwidth of receiver circuit) and repeats the steps shown in step 1 above and notes down his new score (say, X2). He adds up this score to his previous score. The same procedure is repeated by player “Y” in his turn. 4. The game carries on until the score attained by one of the two players totals up to or exceeds 100, to be declared as the winner.