When fighting Saskue, beat him quickly with 3/4 of your life (without healing). You will then see a clip of him using the Cursed Seal. you have to fight him again, but he is harder to beat, with more speed and defense, and with purple chakra
If you want to fight curse mark sasuke, stock up on dual a, b, and c. they are not considered healing items. before fighting him, go on a different trail and fight people until you get your 9-tailed fox guage full. go to lone pine hill and fight him. after you hit him with a few combos, use the 9- tailed fox thing, and punish him. repeatedly use shadow clone jutsu, then run behind him and get some combos on him. he should go down. (remember to use dual items, not healing!) he should use his curse mark. now just start wailing on him. be careful of his combos, as you cannot pause and heal while he is attacking. it should be easier to fill your 9- tailed fox guage now. use it again and start using as many combos as you can (use jutsu's as well). he should eventually go down.
After you pass the mission "Teacher for a day," go back there and you will talk to Konahamaru. He will tell you if you can help him do hand signs.Say yes and you will start doing hand sings.You have to do 100 hand sings correct to get Perfect Strike.
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