Citadel skip is a skip in Jak and Daxter: The Precursor Legacy that spawns Jak at the end of Gol and Maia's Citadel. This bypasses all of the tasks required to progress to the final boss. Once at the end of Gol and Maia's Citadel, Jak is free to collect the last cell that frees Samos from his cage and take the elevator up to the final boss.
There are two main variants of the skip: The Save and Load variant and the Pause Buffer variant. The save and load variant was encountered almost immediately after the release of the game by casual players who decided to save and load their game after watching the first Citadel cutscene with Samos in a cage. This occurred so often during casual play that Naughty Dog patched the skip in later releases of the game, including late Black Label copies, the Greatest Hits version, and the Jak and Daxter Collection on both PlayStation 3 and 4.
To perform the Save and Load variant, you need to enter Gol and Maia's Citadel and watch the first cutscene with Samos in a cage. After the cutscene is over and you regain control over Jak, save your game and then load the game file you just saved. You should then load in at the top of the Citadel in front of the door that leads to the elevator. From here you are free to collect the last power cell that opens the elevator door and proceed to the final boss fight. To perform the Pause Buffer variant, you need to stop at the entrance of Gol and Maia's Citadel right before you trigger the Samos cutscene. From here, you will need to perform a pause buffer, roll jump through the cutscene trigger, then die in the void. After unpausing, the cutscene will be skipped and Jak will respawn at the top of the Citadel in front of the elevator door.
The phrase "Citadel Skip" usually refers to the first version of the skip when Jak warps up to the end of the level. However, there exists an alternative version of Citadel skip for those who have the first version patched. This version is commonly referred to as V2, short for Version 2, and has different variations as well. The current and easiest variation is V2.1, which involves punch uppercutting into slide collision that gives Jak enough height to ledge grab a moving platform above.
Many casual players encountered the save and load variant of Citadel skip in the early releases of the game. The pause buffer variant of Citadel skip was discovered by blahpy. Citadel skip was first documented online on March 29, 2006 on the glitches page of flyingomelette.com
Citadel Skip V2 was discovered by Bobbykaze.