> You were 0px off > 300px by 270px wat Edit: More substantively, the score becomes `NaN` if you click without moving the mouse after pressing Start, because

> You were 0px off > 300px by 270px wat Edit: More substantively, the score becomes `NaN` if you click without moving the mouse after pressing Start, because mouseX and mouseY are undefined until the first mousemove after initialization.