I can confirm this is the first episode, which I just watched since I had no idea about Numberwang until a minute ago. So I guess a true Numberwang fan would know that.
> A NumberWang "board game in a box" was produced in 2008, including the board, numbers, two 400-sided dice, special hosting accessories and all 37 volumes of the rules so that you can say "That's NumberWang!" with confidence. For everyone from ages 8 to 88.
So even the true fan may falter in his or her judgement.