Actually there are a few versions of the test and although there are might be 21 levels in the current test you measure how many "beeps" a person is able to reach. Yes people can go to 100, 120, 140 and perhaps 21 levels X 9- 10 beeps at each level for over 180. In my current school very few kids reach over 110 with 140 being the top score I recorded the least few years. I don't doubt some of the great scores I've read on this message board.