Brain Teasers and Riddles Google Slides presentation promotes critical thinking skills. Fun five-minute activities. If you have five minutes, you can still get those brains working and have fun, too! Brain teasers on animated slides that are sure to make everyone smile. Fun, humorous riddles that will crack you up! Enjoy these when class is not quite over, but the lesson is! You can also use as a fun filler at the end of the year! Or use before or after spring break, or after state testing for c