Ninja Gaiden 4 contains 18 Combat Trials (Challenges). They are unlocked after finishing the story for the first time and are the “Challenges” required for the Challenger of Challenges trophy & achievement. For the boss challenges refer to the Ninja Gaiden 4 Boss Guide.
Combat Trial 1
Combat Trial 2
Combat Trial 3
Combat Trial 4
Combat Trial 5
Combat Trial 6
Combat Trial 7
Combat Trial 8
Combat Trial 9
Combat Trial 10
Combat Trial 11
Combat Trial 12
Combat Trial 13
Combat Trial 14
Combat Trial 15
Combat Trial 16
Combat Trial 17
Combat Trial 18
More Ninja Gaiden 4 Guides:

AHMED TALLAL says
can i play all challenges on hero mode and got the trophy ?
Cocoa says
No they have set difficulties they range from normal to hard. Combat Challenge 5 is horrible. You die in 1 hit
Bortedet says
I did all combat trials and boss trials. Also did all Purgatory trials on Hell difficulty but the Challengers of Challenges trophy is not popping for me, it’s my last one, please help Powerpyxman, you’re my only hope.
Hayabusa says
Did you beat Oniwaka last form ?
Because one more boss challenge appears when you defeat him.
Bortedet says
did
Stanislav says
Did you fought the secret boss in chapter 6, it is the thief in his final form, after defeating him you will unlock new trial boss fight.
Maliketh says
How can I become better at the 1-Hit-K.O. challenges?
They are such a painful experience…
I‘ve only tried them with Yakumo
Maliketh says
F this challenges, worst thing I have ever witnessed in my entire life
Even with Ryu I can’t get past the third wave (Challenge 5)
Choco says
Made it to final wave in challenge 5 and this is one of the most miserable experiences in my gaming life. Absolutely nonsense design.
Ryu is more manageable than yakumo because of the ninpo. Yakumo’s tool weapon makes phase 2 easier but at the expense of every other phase being more difficult. Gonna try getting the accessory to increase ki recovery speed but this is going to be an absolutely awful experience.