sentences:  The game went into development in late 1999, it used a new type of geographic software called "re-flex" (renamed Geo-Mod by Volition) which allowed the integration of fully destructible level maps.It also took the physics engine from the highly successful "Unreal", series as well as its graphics engine, with some key tweaks, that allowed the game to take full advantage of the Dreamcast power, with limited slowdowns and no in-level loading, a problem that plagued the PS2 release of "Red Faction".It also took advantage of the Dreamcast's online support at the time, allowing up to 8 people to take part in an online version of the game's mission mode, as well as up to 18 people in the online arena brawl.