How i beat it, leve 12l goes so hard due to the fact that more what 1 object can spawn. If u get more than 1 just reset until u get your 8 combo at the start when u finish the combo u don't have to hit anymore targets, u can hit some easy ones if u miss some during the combo. The hit percentage is calculated on how many knifes u throw not how many objets u hit good luck.