Her forehead wrinkled as she looked again on the puzzle.

Degree of difficulty: Easy, although it does depend on the puzzle.

Part of him followed up on the puzzle while he answered her question.

The amount of time spent working on the puzzle during the free choice period was used to measure motivation.

She was too tired to dwell on the puzzle for long.

The longer you work on the puzzle, the cheaper the hints become.

The officer looked up after filling in a word on the puzzle.

The "fly people" began their modern assault on the puzzle of learning and memory in the 1970's.

There are a total of 24 wedge pieces on the puzzle.

"The ones who know they're going to get paid spend less time on the puzzle and are less interested."