is known as Survivor. Gameplay is similar to Power Race, however after a given time the racer in last place is eliminated. Powerups are included in this mode and can be used to increase one's place, thus avoiding elimination. The race is over when all human players are eliminated or a human player is takes first place. The two downloadable modes, Deathmatch and Team Deathmatch, are focused solely on dogfights with other players. These modes are played in three new arenas and are limited to online gameplay. Development and marketing The developers said that they wanted to keep a certain amount of realism to the setting of their game. Senior Game Designer Peter Petrekovits described the game's direction as "not a science fiction, but a racing on the most beautiful places on earth". Development began with low polygon versions of the game's three settings to hone gameplay, which were later upgraded with details created from primitive shapes. Artists then took these settings and provided finalized environments while course designers laid out the specific elements to each race. Multiple routes were created in each setting allowing for several course configurations. Some of the plane designs were inspired from real-world fighter planes, but each were evolved from initial concept art into their current designs. Petrekovits elaborated on their design: "These planes are not real life models. You might see some part[s] of them [that are] familiar, but these are whole new concepts". Petrekovits further clarified that though the planes can be equipped with weaponry via powerups, they "are not military planes whatsoever, [they] are racing planes". Two members of the game's development team were graduate airplane technicians. Two downloadable content packs have been released, both of which are actually included in the main game but require premium unlock keys to be accessed. The first, entitled Extreme Fighters Pack, was released on September 21, 2011 and adds three additional planes, the Vanguard, Sparrow X1 and Triwing Vintage. The first two planes feature a design similar to modern day fighter jets, while the latter focuses on older, Red Baron-style planes such as the triplane. The second pack, entitled Gladiator Pack brings six new combat arenas into the game. These new levels have a focus entirely on dogfights, and have all racing aspects removed. Reception The PlayStation 3 and Xbox 360 versions of SkyDrift received "generally favorable reviews", while the PC version received "average" reviews,