Read the hints given in the riddle and guess the word.
I am a box that holds keys without locks,
yet they can unlock your soul.
What am I?
Answer: A Piano
See more: This Brainteaser Will Determine the Sharpness Of Your Eyesight In One Minute
Find out how sharp your mind is and see if you can spot the odd one in the ten trios of numbers below.
Scroll down for the answer.