TED-Ed has a fun animation of the traditional bridge riddle using everyone’s contemporary worst fear – zombies. I would recommend using the video with students in 3rd grade and up, and definitely pause in the middle to give them time before showing the solution. I took a screen shot of some of the vital information to leave on-screen for the students as they try to solve the puzzle. Can you solve the bridge riddle? Search for “riddle” on TED-ed to find even more perplexing puzzles for your brain!