Happens here. Eggman survives an explosion encompassing a portion of the surface of the planet.

Calculation[]

That's one heck of a big boom. If this doesn't get past 9-A...

Diameter of planet in meters: 12742000 (3487 pixels)

Explosion diameter in meters: 1063355.893318038 (291 pixels)

Explosion radius in meters: 531677.9466590192‬

Formula is ((radius/.28)^3)/2 = grams in tnt.

((531677.9466590192‬/.28)^3)/2 = 3423275490000000000 grams of tnt, or 3.773515293 teratons.

Low 6-B, Small Country level.

Conclusion[]

Small Country now has two feats and Eggman has way better durability. Given he's physically fodder and so are the badniks, which can endanger him, they should likely be buffed.

If this sounds inconsistent with Classic Sonic being Low 6-B, don't worry, he'll be upgraded soon.