Question: where are hidden coins in cuphead?
Answer: Tutorial (Inkwell Isle I) © Studio MDHR. The very first hidden coin is located within Cuphead's introductory tutorial. ... 
Gingerbread Girl (Inkwell Isle II) © Studio MDHR. ... 
Juggler (Inkwell Isle II) © Studio MDHR. ... 
Green Shack (Inkwell Isle II) © Studio MDHR. ... 
Stairs (Inkwell Isle III) © Studio MDHR.