Futuremark Games Studio announces this weekend will be another free play period for Shattered Horizon, offering the chance to sample the recent Firepower weapons pack for the multiplayer shooter. The free weekend will kick off on Steam at 6:00 pm EDT (23:00 GMT) tomorrow, and they say preloads will begin at some point this evening. The game will also be on sale at a 50% discount for the duration of the weekend. This page has details on the game's system requirements, as it does not support Windows XP or DirectX 9.