This is the sixth level of the Main Tunnel. There are quite a number of crumbling tiles in the level, and they can be a threat if not handled carefully.
There are quite a number of crumbling tiles in the level, and most of them connect to each other. If you step on one of the crumbling tiles, a pile of crumbling tiles nearby will also crumble, like a "domino effect". These can prove to be deadly.
You should try to avoid areas with many crumbling tiles. Try to jump as few times as possible. This can prevent you from accidentally stepping on a crumbling tile. Though, you will still have to jump if you are in an immediate danger, for example, you are falling into a large hole, and you are going to die.
If you really tipped off a large cascade, you can still patch it up by avoiding that large area of holes, and continue to reach the other end of the level.
Fortunately, this is only an introductory level for the players to meet such large patches of crumbling tiles. In later levels, you won't be so lucky and have adequate space for you to escape from these grey tiles. Hence, you will have to hone your skills to catch up with the increasing difficulty of the levels if you can't beat this level easily.
Tips: If there is only a small hole in front of you, you don't have to jump. The momentum created by the Runner can let her go past the small hole without problem. If the hole is larger, you will have to jump.
There are no achievements relating to this level. yet due to the fact that this level has a great deal of crumbling tiles, this is quite a suitable level to earn the achievement "Galactic Vandalism", though not as preferred as ridiculous levels like Level 10.
If you want to have this achievement done, repeat this level again and again, while destroying all crumbling tiles in this level. In this way, you will have many crumbling tiles to crumble and you will earn this fast.
This is the easiest achievement in the game. Even the beginners can earn this without much trouble.