THE ANVIL METHOD! : KO Submissions

well this is the method :

Basically u need 2 +1 items to make +6 then u need 2-3 +6 items to make +7 and 20 +7 items to make +8... and lets say 50 items to +9

i find this a very good guide for upgrading it might be in turkish but you can understand the main points
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