Introduction
This is Level 3 of Box Storage Area in Run 3.
Suggested Characters: 
Gameplay
For the first part of the level, there is a chain of boxes. Just walk on those.
The second part of the level is all crumbling tile groups. Don't sink too low, but don't jump immediately. For reference, jump on the second to last tile in the group.
The ending is quite similar to the beginning.
New Tunnel
The Coordination Challenge tunnel will branch off this level.
However, in order to access it, you have to beat the Memory Evaluation tunnel and Plan C, part 8.
Walkthrough
Box Storage Area, part 3 Walkthrough (Run 3)