Ah, just had my little brother try it, and from what I heard, he was putting too much emphasis on the -ue part of blue. When he said it while shortening the -ue part, it registers fine. o_o ... Thought I should try sharing this info. ._.;
Speak with a yank accent and it registers every time. My Australian pronunciation of various numbers and colours is no match for Brain Ages refusal to pick up anything I dont say in an American accent.
i have the same problem. i was saying blue in a monotone type of voice but it said try again. so this is wat happened "blue, Try Again, blue, Try Again, blue, Try Again, bleep u" then it finally moved on ^^