Team Fortress 2 [Steam] has a big halloween update, and with it a well needed fix for the Linux version to do with textures.
The problem is that TF2 has been giving people issues with "Out of memory" errors, which this patch improves. It's not totally solved yet, so you may need to reduce your texture option a bit until it's fully solved.
Other than that, the big update adds in new maps, new halloween crates, new taunts, and loads more. See the full changelog here.