'My Sledgehammer Can Be Strengthened Unlimitedly' and 'Apocalypse: I Can Upgrade Unlimitedly' both met the requirements of the title. Among them, the main character of "My Sledgehammer Can Be Unlimited Strengthened" could infinitely strengthen his body and items, while the main character of "Apocalypse: I Can Upgrade Unlimited" could upgrade any item by accumulating Survival Points. I hope you like this fairy's recommendation. Muah ~😗