Naruto: How Hashirama Senju achieved Sage mode, explained

​The Naruto universe has witnessed firsthand how powerful Hashirama Senju’s Sage Mode can be, but not much is known about it.

What kind of Sage mode does Hashirama use and why hasn't any other ninja been able to use it? : r/Naruto

What type of Sage mode is Hashirama using? - Quora

Hashirama Senju, Naruto, Bleach, Fairy Tail & Fullmetal Alchemist Wikia

Untangling the mystery of Six Paths Sage Mode : r/Boruto

In Naruto, what's the different between the different sage modes like “toad”, “snake”, Hashirama's sage mode, and possibly “slug sage mode”? Do they grant different abilities? - Quora

Hashirama Senju, VS Battles Wiki

Six Paths Explained (Naruto)

I was thinking that if Hashirama Senju received half of Sage of Six Path's chakra like Naruto did that Hashirama would even be more powerful than Six Paths sage mode Naruto. Is

Does Madara have Six Paths Sage Mode? He obviously has Six Paths Senjutsu but does he have Six Paths Sage mode? - Quora

Naruto: 10 Things Every Fan Should Know About Hashirama Senju