Note: Haven't tested since the latest patch changed Pure Strategy

I've always loved this map.  Pure Strategy is extra interesting.  Did about 3 or 4 revisions, kept getting surprised ganked in the late 30s.  Still on this build there is a goblin or two that somehow walk uninterupted to the northern crystal, but we easy spot them and have our DPS run and blast them.

This map has (unless someone proves me wrong), the lowest mobs per wave in the game, even in the 30s it's sub-1,000 per wave, so not optimal for armor farming.  But I think it's nice to have 2 monks in for Ace of Spades at end of map.

PROS:  Great pets (sort of) and end-of-map rewards (Weapons and Accessories!); 2 harpoon turrets owning that avenue of approach is beautiful!

CONS: Low numbers per wave (all waves have less than 1K enemies)

*Did not hold up as well on Nightmare, so adjusting the build to make it work better for both.

Build was stable (meaning nothing ever got close to the build), but wandering weak mobs seemed to occassionally get up onto the north crystal.  We found the South crystal didn't need any reflectors.  Seed bombs keep the copters down, DSTs keep the copters/ogres in the South pinged.  If you want to modify, you could drop the webwalls and maybe the golem, for something else (like a DST directed NorthWest perhaps).

Party:  1 Tower Boost Monk, 1 DPS Monk, 2 Summoners with guardian pets (huntress/monk)

I haven't tested the build with Nightmare yet, but probly should work.