Need a fun activity to go along with your Energy unit? Students will explore the different types of fossil fuels, disadvantages, uses, and nations that are the biggest producers. This Google Form activity contains 20 questions. There are five puzzles, and each includes four questions. Students must open five locks. As questions are answered, a four-letter code is generated that will open the locks. Each puzzle contains response validation. Students can't move to the next puzzle until they enter the correct code.