Place this clip right on the cut into the flat scene, then follow it with a Mario Jump as the character starts moving in 2D. Use a Dun Dun Dun buildup before it only when the reveal needs staging, and let this clip mark the actual switch.
关于此声音
The 2 Dimensions clip is a short two-second sound effect built around a flat, dimensional shift moment. It lands as a quick, disorienting punch, making a normal scene feel suddenly stripped down and cartoon-like. The effect is abrupt and playful rather than dramatic, which is why it reads instantly as a visual gag in audio form.