OFB-9

I'll write here since I saw the relevant arguments. Basically, the idea is this: allow 3 Dimension Door on hl+y starting from 211 and 4 Dimension Door starting from 221.

Currently, the rules do not limit the total number of Dimension Doors per turn, and having a main + 2 noob mages with Air Magic and a limit of no more than 2 Dimension Doors per turn with Air Expertise, the map is cleared using them quite quickly anyway. IMHO if each of them is allowed 4 Dimension Doors, it will be absolute madness.