Citadel of Unrestrained Vitriol/Secret Ending

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 had a secret ending(also called the 100% Route) added after the release of the citadel.
To access the 100% route ending, you have to:
* Find 19 secret rooms on each floor
Successfully completing the 100% Route will reward you with its badge: CoUV: 100% Secrets Run
There's a secret room on every floor. You'll need to get into every secret room to access a hatch on the roof of the last floor. Every time you go into a secret room, a sound will be heard, meaning you found it. Getting all of them will make a different sound so you'll know that you found all the secret rooms.
Note that there's also a counter at the end of the citadel, so you can track with it if you miss any of the secret rooms, but you'll have to remember which ones you collected if you didn't do it in order.
No boost items are allowed.(Needs testing)
* The secret room on Floor 5 will change the lighting of the Citadel, and it might make it slightly harder to spot some of the secret rooms. If it bothers you, you can collect it before the secret on floor 9.
* The bomb on floor 9 will have a timer of 5000 seconds(around an hour and 23 minutes), and you're forced to collet it in order to unlock the ending and counter at the end. Failing to get the bomb to the top of the Citadel will result in an instant death.
** If you want to do the 100% Route in a safe way, collect it as the last secret.
* The secret floor on floor 18 has a small obby. As of writing the guide, the lava isn't an instakill so you can simply jump on it until you get to the end of the challenge.
* The secret rooms on floors 10 and 11 requires you to walk more inside the rooms to get it, make sure you hear the sound.
* The secret room on floor 3 is filled with cryptic puzzles, however none of these are required for the secret ending.
* In general, the best way to do this run is to get the secrets in order, so you'll not have to jump down.
** You should complete the normal ending first to practice the citadel.
Rooms' Locations Gallery Guide
CoUVSecretRoom1.png|Floor 1's secret room entrance.
CoUVSecretRoom2.png|Floor 2's secret room.
CoUVSecretRoom3.png|Floor 3's secret room. Note: just walk to the hatch with the blue lightbulb above it to exit the secret room. It'll also teleport you to floor 4.
CoUVSecretRoom4.png|Floor 4's secret room.
CoUVSecretRoom5.png|Floor 5's secret room.
CoUVSecretRoom6.png|Floor 6's secret room.
CoUVSecretRoom7.png|Floor 7's secret room.
CoUVSecretRoom8.png|The hole that leads to Floor 8's secret room.
CoUVSecretRoom8(2).png|Floor 8's secret room.
CoUVSecretRoom9.png|Floor 9's secret room.
CoUVSecretRoom10.png|Floor 10's secret room.
CoUVSecretRoom11.png|Floor 11's secret room.
CoUVSecretRoom12.png|Floor 12's secret room.
CoUVSecretRoom13.png|Floor 13's secret room.
CoUVSecretRoom14.png|Floor 14's secret room.
CoUVSecretRoom15.png|Floor 15's secret room. Note: DO NOT JUMP TO THE ORB AT THE END OF THE PATH- IT'S NOT A TELEPORTER
CoUVSecretRoom16.png|The X-Pusher and hole that leads to Floor 16's secret room.
CoUVSecretRoom16(2).png|Floor 16's secret room(viewed from a different angle).
CoUVSecretRoom16Pusher.gif|The method of reaching Floor 16's secret room.
CoUVBasementSecretRoom17.png|Floor 17 (Basement)'s secret room.
CoUVSecretRoom18.png|Floor 18's secret room.
CoUVSecretRoom19.png|Floor 19's secret room. Note: DO NOT JUMP INTO THE WATER
CoUVSecretWinMessage.png|The win message of the secret ending.