In a brain teaser the LU CKY is Lucky Break.
The gap between the letters Lu and CKY is a break which is a clue to the answer in the brain teaser.
So LU CKY is lucky break because of the break or space between the letters.
To beat brain teasers.
Take a moment to carefully consider the question. Don't feel like you have to blurt out the first answer that comes to mind.
Ask any clarifying questions.
Walk through your thinking process out loud.
Brain Games Improve Your IQ.
Since brainbusters improve your logic, problem-solving, concentration and spatial reasoning, it's obvious that it increases your IQ as well.
A study done by the University of Michigan found that doing challenging brain teasers for at least 25 minutes a day can improve your IQ by 4 points.