Phoronix brings a bit of weekend cheer [phoronix.com] for those silly people inside playing video games instead of going fishing:
With Black Mesa's Halloween update released on Thursday, there is a Linux client beta of this Source game. Details via this announcement [steamcommunity.com]. Black Mesa is currently on sale for 60% off, putting it at just $7.99 USD.
Mind you, it's a Steam game so your box has to play nicely with Steam as a prerequisite.