You could use Brain Flakes, and while you could have a specific challenge, I've found that students make their own creations.
Use your 3D printer to make puzzles. This one was downloaded from Thingiverse.
While you may have a puzzle table out year round, you could emphasize smaller puzzles or other types of puzzles like crossword and Sudoku.
Puzzle Table
Objective: Students will be able to put together puzzles of various sizes and difficulty. They may choose to do this by themselves or as a group.
Why: Students have to use critical thinking skills to assemble a puzzle and increases their perseverance in problem solving.
Supplies: one regular, five or six foot folding table, 4-6 chairs, a variety of puzzles – 100 – 1500 piece puzzles
How To: Put out the puzzle with the box showing the picture. Monitor table for pieces that dropped to the ground and for when they are finished. You may also want to include a sign inviting students to the table as well as suggestions for doing the puzzle.
Things to Think About:
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