This week update (August 3rd) includes new Ninja Exams (141-180). Ninja Exam 180 reward is Scroll of Naraka which can be used to upgrade equipment.
Here some gameplay videos of Ninja Exams 141 to 180. To be honest it’s much easier than the past Ninja Exams which really requires tons of strategy.
Level 141 to 150 Ninja Exam
151 to 160 Ninja Exam
161 to 170 Ninja Exam Gameplay
171 to 180 Ninja Exam
Hope this videos can help. Thank you and God Bless.