There's also the Bazooka-Med bonus level accessed by earning the medal on Sniper's Last Stand. Level 4-0 in Medal of Honor: Allied Assault is accessible only through the console, and looks like it was supposed to be part of Mission 3, but was Dummied Out for progression/pacing reasons.They are based on multiplayer maps from the previous game, and they are very, very hard. The "Panzerknacker Unleashed" missions in Medal of Honor Underground.Unfortunately, the unlock method was so obscure and glitchy to boot that Bungie just made it unlocked for everybody in a patch. Behind the scenes, "Foundation" was a map designer's unofficial side-project, deemed not up to the quality standards of other maps but interesting and fun enough to add to the game, so this unlockable map system was the compromise made. Halo 2 has the multiplayer map "Foundation", which is a remake of "Thunderdome" from Marathon 2: Durandal, and is only unlockable by following some rather specific criteria in the final single-player level.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 Guide Dang It! method of getting the Golden Gun. The former deals with the Drax Corporation from Moonraker, and the latter has Baron Samedi, who somehow procured the 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 Aztec and Egyptian levels in GoldenEye (1997).Wolfenstein 3-D itself had a secret level in a gigantic maze where you collect bonus orbs for high score where you're beset upon by four ghosts.The third - Comm Satellite - is set on a space station accessible via a hidden teleporter and as such, has low gravity and only flying enemies. Oh, and its entrance is an innocuous waterfall in plain sight but can only accessed via a Rocket Jump. 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.
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The first - Lost Station - has noticeably more enemies than usual, but doing it will reward the player with an early Super Shotgun. They were difficult, but you could be rewarded with a lot of points and some weapons upgrades.
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The Playstation 1 version of the original Doom had two secret levels (one being the iconic "Club Doom") that remain exclusive to this version of the game.The second one required you to kill four clones of Commander Keen hanging from a noose to access the exit. Doom II had two secret levels set in levels taken from Wolfenstein 3D, with one accessed from a secret exit found in the other.They are usually accessed by using a hidden, secret exit on a level rather than the regular exit. Pretty much every early 2.5D FPS (and 3D, with Quake) has a secret level at some point or other, whether it's once an episode or just one or two in the whole game.How do you get to it? By swimming to a far, far away island in the 1st level of the game. Toe Jam And Earl has one of the most puzzling floors in the game: Floor 0.Bubble Bobble, NES (and thus Virtual Console) version has a secret path that the players must take to get the best ending.
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Not really a level, as it is just an explorable visual demonstration, but it shows off various experimentations with the art-style of the game and locations. Tomb Raider: Anniversary has the "style units" gained after finding most of the secrets.The Tomb Raider II Gaiden Game Golden mask also has a (very wacky) secret level accessed by finding all the secrets in the previous levels.It appears to have been intended to be a normal level (and showed up in various previews of the game) at first but was cut for some sort of progression reason. Tomb Raider III has a secret level accessed by finding every (well, technically, all but one, due to an oversight) secret.