Pay attention to the visuals... the pink symbols that appear after the text, don't they look like arrow keys...?
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I'm 99% sure the arrows are there for you. They're not immediately in your face, but they are definitely there, bright pink against the purplish background. And yes, they should be random. You need to press the corresponding arrow keys as they appear.
If you really don't think they're appearing, share a screenshot and I can check for sure.