his squad is waiting. He travels through the swamps and bypasses the compounds outer defenses and enters through the main gate, finding his squad just in time to watch them get executed by Strogg forces. Next, Joker escapes on his own to the fuel refinery where he helps the Air Force destroy all fuel production, then infiltrates the Strogg spaceport, boards a cargo ship and reaches the Moon Base, destroying it and the Strogg fleet. Notably, the section of the game that takes place on the Moon Base has low gravity, something that was previously used on one secret level of the original Quake. The Reckoning received mixed reviews. It holds 69.50% from Gamerankings and GameSpot given a score of 7.4/10. Quake II Mission Pack: Ground Zero Quake II Mission Pack: Ground Zero is the second official expansion pack, released on September 11, 1998. It was developed by Rogue Entertainment. It comes with fourteen new single-player levels, ten new multiplayer maps, five additional music tracks, five new enemies, seven new power-ups, and five new weapons. In the expansion's story the Gravity Well has trapped the Earth Fleet in orbit above the planet Stroggos. One of the marines who managed to land, Stepchild, must now make his way to the Gravity Well to destroy it and free the fleet above and disable the entire defenses of the planet. Ground Zero received average to mixed reviews. It holds 65.40% from Gamerankings. Patrick Baggatta of IGN gave the expansion 7.5/10, describing it as similar to the original, but noting occasionally confusing map design. Elliott Chin of GameSpot gave the game 7.9/10, citing it as decent for an expansion and praising the monsters and enhanced AI. Johnny B. of Game Revolution rated the expansion D+, citing bad level design and few additions to the original game, and noted the multiplayer power-up gameplay as the only fun feature. Quake II Netpack I: Extremities Quake II Netpack I: Extremities contains, among other features, 11 game mods and 12 deathmatch maps. Reception Sales Quake II entered PC Data's monthly computer game sales rankings at #2 for December 1997, behind Riven. The game's sales in the United States alone reached 240,913 copies by the end of 1997, after its release on December 9. According to PC Data, it was the country's 22nd-best-selling computer game of 1997. The following year, Quake II secured fifth place on PC Data's charts