I had the same thing happen to me on my second run through it. I took my time a bit and took out all the enemies in the demo. There are quite a few that only appear after you've explored an area completely, rather than just charging right through it. I didn't take much damage either and grabbed all the items there were to find. After finising it gave me a similar message about Hard mode being unlocked, so it's definitely achievable if you persevere a bit :)
Game On is definitely worth a visit. I caught it when it first started here in the UK. It's a pretty good look at how games have come on from the very early days, right upto present day. (Although at the time I saw it, the Xbox was their latest generation console). If you're near London, be sure to check it out.
Hard mode unlockable in BioShock demo
Aug 15th 2007 7:32PM (Joystiq)Hard mode unlockable in BioShock demo
Aug 15th 2007 7:29PM (Joystiq)Game On returns to the UK, London's Science Museum
Sep 18th 2006 10:36AM (Joystiq)