Use it as the recurring marker through a countdown or quiz segment, then finish the sequence with a Bell Ding when time runs out, and save Dun Dun Dun for the reveal that follows the last one.
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This is a very short tick sound effect lasting about 0.16 seconds, a single crisp click with no voice or music in it. It feels precise and a little tense, like a clock marking one second passing and reminding you that time is moving. That tight, clean snap makes it easy to notice without pulling attention away from what is happening on screen.