This is quite impressive. 1up has commissioned a point and click adventure style game based in the Bioshock universe, and it actually plays pretty well.
It's unofficial, but has been written about on the Irrational Games website - so they don't seem to mind so much. Apparently it's a test by 1up to see if creating their own flash games based on popular IPs is a sustainable concept.
We actually really enjoyed it - it's short, but the writing is sharp and the production value are high. Well worth checking out.
You can play it by clicking here
BioShock: The Unofficial Flash Game [Irrational Games]