Are your 4th-8th grade students struggling to differentiate between the independent and dependent variables ( & control) in science experiments? This 100% digital self-checking puzzle an easy way for you to offer practice. Perfect for distance learning! Students identify the independent, dependent or control variable at each question. The answer provides them with a code word. When combined in order, all the code words form a secret message! It's self-correcting -- if they answer all 10 questio