Your question is Weighing Puzzle Minimum Steps. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
There are 8 identical-looking balls, but one is slightly heavier than the rest. Using a balance scale, what is the minimum number of weighings required to find the heavier ball?