[Edited by Sutek, 1/13/2013 6:35:25 PM]

A further note about Zodiac Tournament if you're stupid like me: Look for a single orange fist in the east north east section of Central. See this link for the exact location: Link

As for Nightmare in North Point: It's a little more complicated. From my testing, unlimited health doesn't work unless I run a fresh instance of the game from Steam, and Weak Enemies can crash the game, especially while facing the vampire-like enemies.