Penitentiary

Penitentiary is a map created by Demon Hamster Eating My Wafflez. First being developed in mid 2017 (B1), received a major update in early 2019 (B2A and B3A), and yet another major update in late 2020 (B4). SF2 servers that have this map (albeit most of them having the outdated versions, which is expected to change) include Demon Hamster's SF2 Server, District: Zen, NxN Nameless' SF2 Server, and even Glubbable's Servers.

Description
The map takes place in an old, rotting penitentiary at an unidentified location (considering the name of the map, somewhere in North America). It's style is dark, damp, and lifeless; there's garbage laying around and one can hear metal creaking in the distance.

In Slender Fortress
The goal of the map is to find 10 keys (specifically Invasion Crate keys) in order to unlock the upper gate to escape the map. Most keys are found in cells, other rooms, and even in corners. One key spawn in particular is hidden on a table behind bottles of pills, which can easily be missed if one doesn't see the glow. Once all 10 keys are collected, players must head to the now-open upper gate and walk down a short path to the exit. Extreme caution should be exercised while heading down the path, as a boss may spawn ahead, forcing players to backtrack. In the 2020 update, although an additional route hasn't been added, there is a new room down the escape path players can hide in if bosses spawned right at the exit. Warning lights were also added, which flash red upon the escape phase, giving a visual on where the escape is at. Overall in the 2020 update, optimization, improved lighting, and Quality-of-Life additions/tweaks were implemented.

Waiting Room
Pre-B4: The waiting room is a typical lobby area, complete with a PvP and swimming pool. There's a jukebox nearby if one wants to listen to some tunes. Being a map created by Demon Hamster, there's bound to be a secret somewhere.

Post-B4: The 2020 update introduces a brand new waiting room created by Demon Hamster. It's style is reminiscent of that of a prison, fittingly so. It contains a PvP arena, a monstrous parkour, and other goodies.

Trivia

 * Before the map's development, Demon Hamster wanted to create a Nova Prospekt map for SF2. However, due to his lack of mapping skills back then (and later, the map not looking anything like Nova Prospekt), he decided to name the map Penitentiary, which is a North American term to describe prisons, especially state prisons.
 * One of the rooms in the map is based on the barber shop room found in the Eastern State Penitentiary of Philadelphia, Pennsylvania.
 * The one far basement to the RED spawn's right is copied and pasted from an old version of slender_bloodwood. Originally, the cabin's basement was simple and had no tunnel.
 * As of the B4 update, the map was added to none other than Glubbable's Servers on November 26, 2020. Staff members took a liking in the map and asked Demon Hamster if they could add it to the servers, an offer that has been accepted. This marks the first ever time Demon Hamster was able to get one of his works into Glubbable's Servers, ignoring the Classic Anathema model fix he sent to them earlier.
 * The map's music (pre-B4):
 * Intro Music: "Threatening Short" composed by Kelly Bailey.
 * Page Music: "Nova Prospekt" composed by Kelly Bailey.
 * Escape Music: "Forget About Freeman" composed by Joel Nielsen.
 * The map's music (post-B4, may be changed again due to copyright concerns)
 * Intro Music: "Damnation" from Quake.
 * Page Music: "Aftermath", "The Hall of Souls", and "Focus" from Quake.
 * Escape Music: Same as it was in earlier versions due to players liking the current escape music choice.