For a limited time only, new duel quizzes will be available. Complete the special challenges available in Duel School to obtain Skull Knight, gems, and other rewards! You can only obtain each rewards once.
The last obtainable reward shown is Skull Knight, which does have high attack and good defense, but both the fusion material monsters are low level fiend monsters with low stats. These cards seems to be aimed towards newer players, or fiend decks as the event description says.
The first and second challenge are available after the maintenance, next challenges will be released daily. The event ends on May 16th, while the last written challenge is going to be released on 13th. This could either mean more challenges added later, or just giving some time for players to finish the quizzes.
All duel quizzes have the same objective, which is to use the cards given to you and "win in this turn!" This section contains spoilers for the answers to the quizzes. Do not read further if you prefer to not know the answers.
No offense for any readers here, but actually IMO the rewards are retard, and the only thing I love in this event is the "quiz", so I didn't read any walkthrough of this event written here or other pages, hope I got the same one :)
Challenge #6 is not that hard but it can trick you a bit: You do the following:
1. Activate Obedience Shooled (while you control no monsters of course) and Special Summoned the 3 listed monsters in Attack Positon.
2.Tribute Summon Green Baboon in Attack Position by offering Rodenut and Uniflora.
3.Enter Battle Phase and attack with Nimble Musasabi vs Sonic Duck, then activate Yellow Baboon's effect to Special Summon it from your hand in Attack Position (it doesn't matter what monsters you banish)
4. Activate Nimble's effect to Special Summon 2 more to your opponent's field.
5. Attack both Nimbles with Green and Yellow Baboons.
I went to "test" whether or not the effects of Nimble were being negated by Obedience School.
Obedience School is negating Nimbles continuous effect which is "cannot be Tribute for Tribute Summon".
If you try to tribute it for Yellow or Green as a test, You will see it does allow them to be summoned.
Thus, Obedience School is negating the the field effects like it suppose to be.