When interviewing I find that you can't start by asking a really challenging question if you're towards the beginning of the loop. If the candidate happens to

When interviewing I find that you can't start by asking a really challenging question if you're towards the beginning of the loop. If the candidate happens to bomb that one interview and gets flustered, it can easily tilt them for the remaining interviews which kills the signal you get from those later interviews. So ideally you ask a question that on the surface can be simplified to about fizzbuzz level, but can be seamlessly scaled up to higher difficulty. So yea literal fizzbuzz is bad 'cus it doesn't scale up at all. But a similarly easy question to start with...