This is level 59 of the Main Tunnel.
All those crumbling tiles like the set on Level 39 would scare most players into avoiding crumbling tiles entirely. Thankfully, this is different. These are only big patches of tiles, which will still crumble, causing a problem if you still happen to be on one.
So you need someone fast to quickly escape the crumbling tiles. The Lizard wouldn't be a good idea, but it is capable of jumping quite high, which can help shoot you back into the level, though very impractical.
The Runner, as the all-rounder, is considerably fast, and jumps quite high. The Skater, despite uncontrollable, is fast, and able to quickly escape the blocks, but be aware of his low jump-height. He's still recommended, since you don't really have to move side to side much anyway.
- There's an optical illusion on some 'Snake' levels (e.g. Level 20). See the crumbling tiles in the distance of the photo? The crumbling tiles seem to bend inward, but they don't.