These fun, easy-to-use detective mysteries are suitable for Grades 4 – 12+. Some mysteries may be more challenging for younger students, but teachers and parents can always provide hints when needed. The mysteries develop critical thinking skills by requiring students to read carefully and analyze and synthesize information to guide their decision-making. The mysteries also develop observation skills, reading comprehension, deductive and inductive thinking skills. The ability to identify and evaluate evidence is the very heart of critical thinking. For a more lesson-based approach to teach critical thinking, we recommend The Basics of Critical Thinking (Grades 4 – 9) and Practical Critical Thinking (Grades 9 – 12+).