First step is an asynchronous video interview where you have 20-30 seconds to think about the question on the screen. You also have only 1-2 minutes to answer these questions. A "thinking timer" will appear on the screen as a countdown and then your recording will begin. It contained 6 questions and answers can only be recorded once. The interview questions are not difficult but expressing suitable answers while being aware of a timer, feeling pressured to be perfect (cannot be paused or re-recorded) and not having space for true elaboration of thought puts extreme stress on even the most knowledgeable and suitable candidates. I would say that is what makes the interview difficult - not the actual questions.