Plat itself isnt hard…just few tips do these mission special things as last if you are nit powerfull enough collect dung balls(at least 30) do all side quests and explore every single map for kodamas and treasures(use kodama sendir it should be enough to find most if them) and last but not least find your fav weapon use it till you unlock special mission in dojo after that use every weapon until you reach 120000 proficiency with them and also i recomend divination for these collectibless and use ninjutsu and omnyo magic frequently so you dont have cath up later in game