how do i advance difficultys

[Kyrith_Ranger_Pso]

plz tell me ty in advance

[Peelbash]

Ya gots to beat all quests except eternal tower on normal to unlock quests in hard difficulty, then beat all the hard quests except the eternal tower to unlock super hard quests the beat those and you're done.

[xSHiNOx]

beat story mode unlocks hard mode
beat 101 floor eternal tower quest on hard to unlock super hard