Ninja Dog Difficulty – Ninja Gaiden Black
Before the Dark Souls series, there was Ninja Gaiden filling the role of “super challenging but rewarding” game franchise. Ninja Gaiden Black in particular is a beast. There is an easy mode, called “Ninja Dog Difficulty,” which can only be unlocked after dying three times in the first level. If you go for this option, Ayane from other Ninja Gaiden and Dead or Alive games will appear and help you finish the first level, insulting you the whole time.