** ''Quake 2'' had three secret levels. The first - Lost Station - has noticeably more enemies than usual but doing it will reward the player with an early Super Shotgun. The second - Sudden Death - is an interesting one: upon entering, you have 30 seconds to grab as much stuff as you can then you're thrown back to the previous level and can't enter again. Oh, and it's entrance is an innocuous waterfall in plain sight but can only accessed via a RocketJump. The third - Comm Satellite - is [[ThatOneLevel set on a space station accessible via a hidden teleporter and as such, has low gravity and only flying enemies]].
* The Aztec and Egyptian levels in ''VideoGame/GoldenEye1997''. The former deals with the Drax Corporation from ''Film/{{Moonraker}}'', and the latter has [[Film/LiveAndLetDie Baron Samedi]], who somehow procured the [[Film/TheManWithTheGoldenGun Golden Gun]] and is taunting MI6 with it (that level doesn't make a whole lot of sense story-wise, come to think about it). The levels carry their own unique challanges: the Drax soldiers have an over-reliance on grenades which sharp-shooting players can turn against them, and the Egyptian tomb has a GuideDangIt method of getting the Golden Gun.

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** ''Quake 2'' had three secret levels. The first - Lost Station - has noticeably more enemies than usual, but doing it will reward the player with an early Super Shotgun. The second - Sudden Death - is an interesting one: upon entering, you have 30 seconds to grab as much stuff as you can, then you're thrown back to the previous level and can't enter again. Oh, and its entrance is an innocuous waterfall in plain sight but can only accessed via a RocketJump. The third - Comm Satellite - is [[ThatOneLevel set on a space station accessible via a hidden teleporter and as such, has low gravity and only flying enemies]].
* The Aztec and Egyptian levels in ''VideoGame/GoldenEye1997''. The former deals with the Drax Corporation from ''Film/{{Moonraker}}'', and the latter has [[Film/LiveAndLetDie Baron Samedi]], who somehow procured the [[Film/TheManWithTheGoldenGun Golden Gun]] and is taunting MI6 with it (that level doesn't make a whole lot of sense story-wise, come to think about it). The levels carry their own unique challenges: the Drax soldiers have an over-reliance on grenades which sharp-shooting players can turn against them, and the Egyptian tomb has a GuideDangIt method of getting the Golden Gun.

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* The secret levels in ''PerfectDark'' are markedly different from those in ''[[VideoGame/GoldenEye1997 Goldeneye]]'' mentioned above. Instead of brand new levels with no plot significance, they're retreads of previous levels from a different point of view, which reveal different parts of the story. The first one shows how an alien {{Mook}} [[spoiler:kidnapped the CEO of dataDyne (she was later killed aboard the ship) and imploded the building, effectively destroying the company]]. The other two missions let you play as the [[TheGreys grey]] aliens, one where Elvis alerts the Institute of being captured by Area51 and you play through the entire level with diminished health, and the other has you play as a soldier among a platoon who landed on the planet after Joanna dropped the shields. Both missions are ''[[BrutalBonusLevel insanely]]'' difficult.
* ''VideoGame/{{Marathon}} Infinity: Blood Tides of Lh'owon'' has several of theses, which are either alternate endings where the W'rkncacnter destroy the universe, or "co-op carnage break" levels that can (or are supposed to) only be accessed in multiplayer mode. Then there's the three Vidmaster's Challenge levels, found via a secret exit on the final stage. Taken to impossible levels with "Hats off to Eight Nineteen," a map that can be compiled using hexadecimal code present in game.

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* The secret levels in ''PerfectDark'' are markedly different from those in ''[[VideoGame/GoldenEye1997 Goldeneye]]'' mentioned above. Instead of brand-new levels with no plot significance, they're retreads of previous levels from a different point of view, which reveal different parts of the story. The first one shows how an alien {{Mook}} [[spoiler:kidnapped the CEO of dataDyne (she was later killed aboard the ship) and imploded the building, effectively destroying the company]]. The other two missions let you play as the [[TheGreys grey]] aliens, one where Elvis alerts the Institute of being captured by Area51 and you play through the entire level with diminished health, and the other has you play as a soldier among a platoon who landed on the planet after Joanna dropped the shields. Both missions are ''[[BrutalBonusLevel insanely]]'' difficult.
* ''VideoGame/{{Marathon}} Infinity: Blood Tides of Lh'owon'' has several of these, which are either alternate endings where the W'rkncacnter destroy the universe, or "co-op carnage break" levels that can (or are supposed to) only be accessed in multiplayer mode. Then there's the three Vidmaster's Challenge levels, found via a secret exit on the final stage. Taken to impossible levels with "Hats off to Eight Nineteen," a map that can be compiled using hexadecimal code present in game.

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