Please watch the video for the walkthrough.

STAGE 3 Before the BOSS room Item:HP Max UP
Method 1:Dash left and jump and double jump to platform.
(Only Ultmate Mode,Because Dash need sacrifice ally after beat STAGE 3 BOSS)
Method 2-1:Double Jump left make character touch the Item,it will die,but Item will geted(even die without LIVES)
Method 2-2:Jump left and air jump right when character under Item,make character touch the Item(it will not die,but need a little skill).

STAGE 4 second half Item:MP Max UP
Method:Dash left and jump,when character under the platform of under Item,air jump left,make character touch Item.

STAGE 6 Beginning Item:ATK UP
Method1:Walk left make character go down from platform,air jump right when character under the platform of middle,you can stand on the platform.
Method2-1:Use the fortified air attack(Crescent Moon)when near the plaform to break special block.
Method2-2:Use Charge Slash break special block.(Only Ultmate Mode)

STAGE 7 first half Item:DEF UP
Method:Double jump right to the platform.

My Engnish so suck,please let me know if the grammar is wrong.Thank you.