Here's what 218 looks like:
The problem I normally have with these is that it's really difficult to get the vertical Blasters to the corners or the horizontal Blasters to the bottom. Everything considered, this one wasn't too bad, and the time frame seems fair. You do have to keep a brisk pace to unlock the locks in time since you can't extinguish the fire until the lock is gone. (Like chains can actually contain flames, haha)