Quake 2

Quake II in contrast to QUAKE, has a tighter plot and story-driven missions. The game isn't broken into episodes, but rather into three chapters that chronicle your attempt to disable the alien defense system. Chapter one involves eliminating the security grid that protects the industrial defense complex; chapter two deals with destroying the defense system; and chapter three is the final showdown with the alien bosses. What's most compelling is that you'll have to travel between levels to solve certain puzzles, such as deactivating power grids and unlocking doors. To guide you through the puzzles, there may be a portable computer that pops up to provide in-game hints. Among the different units are an abandoned base, a warehouse, a detention center, a security complex, a mine, a factory, a power station, a hanger, and a lab. These areas will be more functional than those in QUAKE, meaning that a hangar will look like a hangar, complete with aircraft in storage, and a detention center will have cells and guard stations.