This week has been an exciting one for fans of Valve Software's Team Fortress 2 class-based shooter. On Wednesday, we were formally introduced to everyone's favorite long-distance assassin, the Sniper. Thursday saw the release of the Pryo update, which included 35 achievements and three new weapons for the fiery class, in addition to two new community maps.

Rounding out the week is a reminder that Team Fortress 2 is free to through tomorrow evening, so gather some friends online and revel in yet another Valve masterpiece.

For interesting behind-the-scenes info, browse the brand new TF2 Official Blog, a handy repository of information and strategies from the game's developers