D&D 5E What rules for older editions have DMs imported to their own 5e games?

You could just count squares. The 20ft radius of a fireball covers what…52-ish squares at 5ft each.
It's way more than that in 3D, especially if you consider the average use is only a hemisphere. Under the base diagonal rules, you'd have 64 squares times another 8 horizontal layers for a total of 512 squares. It's less if you use the corrected diagonals variant, which I couldn't math well enough, but it's still a lot of squares.
 

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overgeeked

B/X Known World
It's way more than that in 3D, especially if you consider the average use is only a hemisphere. Under the base diagonal rules, you'd have 64 squares times another 8 horizontal layers for a total of 512 squares. It's less if you use the corrected diagonals variant, which I couldn't math well enough, but it's still a lot of squares.
It would be 368 squares. Most dungeons have 10' tall corridors. So cut that in half for 184 squares. That would be amazing. Make wizards think twice about dropping fireballs like candy in dungeons.
 

Dungeon Delver's Guide

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