|This location exists primarily or exclusively within the Sonic Boom continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Sonic Boom: Rise of Lyric
The Sky Citadel (スカイ・シタデル Sukai Shitaderu?) is the eighth area of Sonic Boom: Rise of Lyric. It is a marvelous city from the Ancients located in the clouds above Bygone Island, where it is held up by mysterious technology. Virtually untouched by time, it is an archaeological marvel.
In their quest for the final Chaos Crystal, Team Sonic journeyed to the Sky Citadel to find the Sky Crystal. However, they were forced by Lyric to surrender their Crystals in exchange for Sonic's life (right before he quashes the deal by having his robots shoot Sonic on the spot). Not quite beaten yet, Team Sonic pursued Lyric through the floating city as it collapse to stop him from destroying the world.
The Sky Citadel is, in its simplicity, an enormous city from the Ancients located in the upper cloud layers. It is surrounded by clouds which have a slightly violet tint and block any view of the earth's surface below them. However, the sky can still be seen above.
The Sky Citadel is comprised solely of buildings suspended in the air by unspecified blue orbs on the bottom of them. As such, the area is devoid of any solid ground. The whole city is made of pale rock, and its architecture heavily features pillars, overarching openings, curves and dome-shaped rooftops. Structures here include temple-like buildings, enormously tall walls, floating platforms, ring-shaped roofs and interwoven roads, most of which are held up by pillars suspended in the air. Adorning the surfaces are golden rims and the Ancients' markings. Additionally, floating around the city are cylinder-shaped towers and long arch bridges of immense size. The city also has some flora in form of planted trees and bushes.
Though ancient, the Sky Citadel is in fairly good condition, its only wear being a few cracks, some rubble and a couple of collapsed roads. Some towers show more extensive damage though, having large vines growing out of crumbling walls.
A thousand years ago, the Ancients hid the Sky Crystal in the Sky Citadel so that Lyric could not find it.
When Team Sonic tried to reach the Sky Citadel through the Seaside Harbor Light to get the Sky Crystal, only Knuckles and Amy got through. As the pair journeying through the city, Sonic and Tails reached them in the Tornado. Soon after, they found the Sky Crystal, only for Destruction Troops to surround them. Lyric then appeared and explained that he let them find the Crystals so he could steal them. Sonic refused to hand them over, but Lyric threatened to Tails, Knuckles, and Amy that he would kill Sonic if they did not. Reluctantly, the heroes surrendered their Crystals. Instead of keeping his promise however, Lyric had his robots shoot Sonic down and burry him in rubble.
As Lyric left with the Crystals, Tails, Knuckles, and Amy dug Sonic out and discovered to their relief that he was still alive. The group then took off to stop Lyric. With the Sky Citadel collapsing around them due to Lyric's army, Team Sonic headed for the Tornado. Though a chuck of rock broke the road as they got ready to take off, Tails got the plane flying and team headed for Lyric's Lair to stop the villain once and for all.
In the Sky Citadel, the player travels through the floating city. Like the other areas in the game, the Sky Citadel includes a speed level section near the end, where the player runs down a long path with speed-enhancing gimmicks while avoiding hazardous obstacles, and as well slower-paced areas for exploration and combat. It also features the normal puzzles that the player must solve with the Enerbeam mechanic and Buttons. Unique to the Sky Citadel, there are laser beam puzzles, where lasers must be redirected into nearby receptors, most of the time through several cannon-like links which can either be set to receive the laser or moved to alter the laser's direction. Both these actions can be done by attacking these links. The lasers can also be blocked by obstacles which must be destroyed.
The Sky Citadel contains several gimmicks for all four playable characters' specific actions. This include Spin Ramps and Air Targets for Sonic, Tails Vents and Buddy Bot sockets for Tails, Climbable Walls and Ceilings for Knuckles and Balance Beams and Beam Swings for Amy.
Gimmicks aside, the Sky Citadel has several environmental hazards. Amidst suspended roads made of rectangular platforms, there are those marked with horizontal lines that will instantly crumble over bottomless pits when stepped on. On both floors, walls, roofs and even gimmicks there are as well poles with spikes that rotate over a large area which cause damage upon touch. Similarly, there are spiked balls on both walls and roofs (some of which are moving), and swinging pendulums with spikes blocking the paths. Additionally, Knuckles' climbable surface can have sharp spikes that sprout out in intervals, and Amy's Balance Beams can fall apart or be crushed by pendulums. Also, along the level's extensive Ener-Rail sections there will be spiked pendulums and collapsing towers.
In the beginning of the level, the player's objective is to find the Sky Crystal. First the player must go through a door on the opening path by unblocking a laser. This leads to a bigger area where the player has to solve three laser beam puzzles that are found along the sides of the area and in the middle. Solving these puzzles opens a door to a dangerous passage above a bottomless pit. Continuing down this path will take the player to a plaza-like area where the paths splits in two. The player must go down each path (the order does not matter) and solve two laser beam puzzles along each way. This will reveal Bounce Pads in the middle of the area leading to the Crystal chamber. In the chamber, another laser beam puzzle must be solved on the platforms above to unlock the Crystal. This will trigger the cutscene where Lyric takes the Crystals.
At this point, the player's new objective is to escape the Sky Citadel. Ride the Ener-Rails in front of the current arena to a platform where the exit is blocked by a sealed door. The player must use Amy to get on the other side of the door using the Balance Beams on the left, and break the pink locks on the door to let the others through. Now clear out the enemies and one of Lyric's airships will fly in. Switch to Tails, board the airship and send Buddy Bot into each of the sockets on the ship's three glass domes which will cause the ship to crash. It is important to time this correctly, or Buddy Bot will be smashed by the spiked poles inside the domes. The player must also clear out nearby enemies, or Buddy Bot will go after them.
After the ship has fallen, ride an Ener-Rail to another blocked door. Switch to Knuckles and climb up to the two platform surrounding the area, where the Enerbeam must be used to open the door's locks. Ride the Ener-Rail on the other side of the door to some platforms and use Sonic to go down a path to the left which lead to a Button. Pressing this Button will open a path to a speed level section. Once the player arrives at the Tornado, the level is completed and the player is taken to Lyric's Lair.
- This level bears many similarities with Sky Sanctuary Zone from Sonic & Knuckles.
- When Team Sonic hand over all their Chaos Crystals to Lyric who then flies away with them, the Shock Crystal and the red Crystal are not shown among them. Also, in the first scene where Lyric leaves with the Crystals, he is shown having two Verdant Crystals.
- The Sky Citadel is the counterpart to Cloud Sanctuary from Sonic Boom: Shattered Crystal.