Browse Printable 3rd Grade Puzzles & Sudoku Worksheets ... Fun Fun Math Puzzles Worksheet 1 2 3 Search Printable 3rd Grade Puzzles & Sudoku Worksheets Brain teasers teach critical thinking, problem-solving, and fun. Third grade puzzles and Sudoku worksheets incorporate all these components into easy-to-use worksheets. These pages are selected for children aged 8 to 9 by real U.S. educators.