Crumbling Bridge is an in-game Achievement in Run 3.
So far, the best character out of the characters going home is the Pastafarian. The best tactic is to avoid large areas of Crumbling tile-made platforms and sticking to the Normal tile-made platforms and single Crumbling platforms.
Stay close to walls when walking on the light bridge, and run across single platforms whether they are damaged or not. This will get you through all (or most) of Plan A, part 2. This tactic is somewhat used in the Achievement; Living Superball.
You could also use the Bunny, and when you start the level, immediately go to the right. Then hop onto the small platforms. Keep doing this to the end.