In answer to mavhc: we /do/ support the UPP, and IMHO everyone should. The browser issue is overwhelmingly important.
Does HTML compare to Logo? Does it matter? I would teach basic HTML regardless.
In reply to Andrew Duffell: indeed he didn't, AFAIK. There is an ambiguity in the text. The author /was/ a student at the time, but not here, I regret to say. Super little game though. I hope I thanked the author, if I didn't, I do so now.