How to get a level 82 boss map?

Question: if you found a +1 to monster level of area map and you have an open tower in range...

Could you play *all* maps around the tower except the +1 map to force the irradiation+boss precursor tablet on this single map?

Yes. That's how I did my last 2 points in 0.2.0. At this point however, more Nexuses are spawning, so it would probably be less tedious to just uncover 2 or 3 of them. I've already squirled away 6 or 7 82 ready maps for the new patch.

you got to sacrifice a goat for that

Bad news. You can force an irradiated precursor tablet on a certain map by playing/attempting all other maps that could possibly affected by the tower... but this does NOT work for boss overseer precursor tablets. I applied 5 overseer precursor tablets and some of them didn't add a single boss. That was a lot of work and playtime around this stupid cleansed +1 map... for nothing.

I guess I was just lucky...