Sony Computer Entertainment Europe has announced the release of Killzone Chapter 5, a free downloadable episode set in the underground labyrinth beneath Sedah City. In addition, the new episode comes bundled with Infrastructure mode, enabling Killzone: Liberation players to take the action online for the first time.

Chapter 5 includes four new missions and two new multiplayer arenas, with Infrastructure Mode introducing online Duel Mode 1vs1. The new mode has been adapted for play with only two players and features play areas with significantly reduced combat zones.

You can get the download from and the re-launched website, which also features enhanced community features including friends, forums, polls and direct contact with developers. PSP users with access to Wi-Fi internet can also grab the new content from the in-game menus.