Well personally i dont struggle with the questions, but 99-48 can be a pain in the ass for a lot of people
make them even harder for all i care!
point is it seems pointless! atleast explain why you have this login question by simply writing "This feature is implemented to avoid experienced bot-abuse in the game" or something similar! No offence killmark!
i like Mzyxptlk`s suggestion though! it has potential. lets say you have to click on the cat and when you click on it you have to read about the cat, and not proceed until you have clicked on "i have read and accepted the main purposes of the cat"
just to make the stupidity a bit more stupid, but yet so much more interesting then numbers!