Video-guide of Knack to get the trophy Combo Professional and Professional Intruder. For this you need the Combo Meter. Once you get it select level 4 - 2 and complete it making sure the robots with a front light don't detect you. Also you can't get hit, or they'll broke the combo. In addition, if you select hard difficulty you can also get the trophy Perfect Action, which consists in finishing the level unharmed. Although you'll have to pick more crystals, so the enemies leave less crystals in hard mode.
At the beggining of the video I speak in Spanish but it's just and introduction and I don't say anything relevant. If anyone make a negative vote please tell me why, so I can improve my future videos.
Greets.