First off, let me say that I tried these codes and they work.
The first is a zen hack, just follow the steps from this Youtube
video. The second trick is a method to level up your character with ease. Go to the execution room, select your challenge, select co-op play, select search and add hsh1619. Once found (which the co-op player is oddly level four) select the co-op player. That character is strong ass hell, all you got to do is let him do all the work and gather all the experience for yourself. Enjoy