@DZcarlos - All right except 14. Z is the odd one out because it isn't a button on the xbox controller (the buttons are A, B, X and Y)
@Agroagro - Green isn't a primary colour, that's why it's the odd one out. Red, Blue and Yellow are Primary colours.
Also, good point about QTVI. I think i'll add multiple choice answers in the next version.
@pbsb - It's V because its on a different row to Q,T and I on a QWERTY keyboard :)
Ok, thanks for all the great feedback!
I'll make sure there are more questions and variations on answers (i.e. Album Names and Song title. Thanks Trojan).
@ragnarok73 - Just because a band is in here it doesn't necessarily mean they're any good :P
Not bad, you should add more to the tutorial though (like I've done in Square Tower Shooter 2).
@FrozenSkull9pt - It's not a copy of STS2, it is based off the same tutorial though.
 "Odd One Out"){kind=icon}
 "The Possible Quiz"){kind=icon}
 "Guess the Band: Metal Edition"){kind=icon}
 "My First Tower Defence Game"){kind=icon}