I have sung the praises of Sporcle.com (here and here), the game site that can teach you more than you learned in grad school. First they had the U.S. presidents. Then they added things like African countries, and the periodic table of the elements. Now they’re adding games at a breakneck pace, and along with the expected pop culture quizzes on cartoon villains, you can crack your brain on obscure and mind-bending tests like naming the 54 Danish monarchs between 934 and the present day. FYI: “Hamlet’s Dad” is not an acceptable answer, but “Eric the Memorable” and “Gorm the Sleepy” will both work. I always forget Eric.
And by the way, I’m chagrined to report that I could only get 44 out of 50 correct on the Monty Python and the Holy Grail quiz. Can you top that?
Anyway, I didn’t want to get sucked into talking about Sporcle again. What I wanted to do was point you to an entirely new and seductive way to waste hours of your precious time. On MakeUseOf.com I got introduced to the amazing head-to-head geography challenge called Geosense. You get paired with another player, they flash up a city like “Vientiane, Laos” and you have to click on it on an unmarked world map faster and more accurately than your opponent. Hard and fun. Try it.
Rambles Blog at Star Chamber 
46, and I missed “Dingo” and “Princess Lucky” . DON’T LOOK AT ME!
OK, I know this thread was not supposed to be about Sporcle (and I did try out the Geosense site — very good!), but they clearly put some effort into fuzzy answers. I remember reading in their blog about solving disputes by allowing multiple spellings and bonus answers, like putting Obama in the US presidents quiz as a bonus answer prior to his actual inauguration. I mention this because whilst taking the Holy Grail quiz, I came upon the question ‘And what do you burn, apart from witches?’ to which I answered (as any of us would have), ‘more witches’ and the software accepted my answer by filling in the answer, ‘wood’!
I noticed the same thing, only I was typing (as one might) “bread” in response to “what also floats on water”. I’m guessing “very small rocks” might also work, but I didn’t perform the experiment.
I got 57/50 on the Holy Grail quiz by finding some hidden bonus answers. I have a feeling there’s more than just the 7 I came up with.
For example, type in the name of Herbert’s castle.
doh, I got 47/50 and, like Mike O, two of the ones I missed were Dingo and Princess Lucky. Even after seeing “Dingo” I can’t picture it. But I can now hear Michael Palin saying “You’re marryin’ Princess Looky, so you better get used to the idea.”