Crossword Puzzles - Crossword puzzles provide a fun and easy way for ESL students to improve their vocabulary and spelling skills. The intellectual stimulation provided by solving crossword puzzles keeps students focused and engaged while creating a joyful atmosphere in the classroom. If the puzzle clues prove too difficult for your students, you can always make things easier for them by writing the words from the answer key on the board. Allowing students to work in pairs will also make solving the puzzles faster and easier.