(1) The paper publishes two brainteasers every Saturday.

(2) There were some real brain-teasers in the quiz.

(3) Then both groups took the brain-teaser test again.

(4) Back when they were the evil empire where everyone secretly wanted to work, they were famous for their "brain-teaser" interview questions –Why are manhole covers round?

(5) The answer reminded me of a brain-teaser that's been entertaining me for the past couple of months.

(6) Similar brain-teaser programs are available on home computers, sometimes free of charge. The scientific jury is still out on the efficacy of such software.