Completing your atlas in Standard for 3.28

Something that wasn't obvious (to me) was the fact that we have to play the four corner sections on the atlas. Do bosses in order to progress into Nightmare (formerly tier 17) maps. There are five extra atlas passives available when you complete the nightmares. The old tier 17 maps that you may have still works.

Before that, you have to play the non-uber bosses again like Shaper, Eater, Exarch, Loneliness, and so on. I was wondering why I couldn't click on the nightmare maps and play them. Just fyi. Also type /atlaspassives to see if you missed anything.