Team Fortress 2 fans? Valve is beta testing a series of new maps for its hat-filled free-to-play multiplayer FPS, and all current players have a chance to check them out prior to their public launch.
Starting this week, Team Fortress 2 players can opt-in to the beta test by enabling the "Play Beta Maps" option within the "Play Multiplayer" menu. Don't get too attached to what you see, though – Valve warns that beta map layouts will change frequently based on player feedback, and existing rule sets may see "drastic swings" as testing continues.
Valve is also offering a set of official beta servers to power quickplay matchmaking, and community servers are also welcome to host beta maps.