City of the Millennial Tree

City of the Millennial Tree, originally subtitled Episode II, is a Breakout Episode released on April 28th, 2018 in the Season 3 update for Cookie Run: OvenBreak. It is an ancient city set within jungles, with statues and artwork themed after worship of Millennial Tree Cookie. This episode contains stages designed differently from typical Cookie Run stages, with much vertical movement and large optional paths. This unorthodox design conflicted with some Cookie Skills, and the offending Cookies were made unplayable here.

When first added, this episode had only seven stages. The Legend of the Millennial Tree update on September 28th brought Pomegranate Cookie and four new stages, based on the story of her attempting to curse the Millennial Tree. The Legendary Pets and  were originally the special Mystic Jewel Rewards, and Millennial Tree Cookie was not added to the Rewards List until October 8th, completing the story in the Purify the Millennial Tree event.

Currently, this Breakout is only rotated in the Breakout: Random Challenge.

Ban list
When the episode was first released, all Cookies and Pets were available. Skills that cause the Cookie to move in a set path, such as the skill of Adventurer Cookie, made it impossible to follow some paths. Due to fan feedback, the Legend of the Millennial Tree update brought about a Ban List, and Cookies and Pets whose skills were obtrusive were made no longer available in City of the Millennial Tree.

The list of all Cookies and Pets that were banned follows. Note that this list contains every Cookie and Pet that was banned at the time the episode was removed. Some Cookies listed were playable after the initial ban but were banned later, such as Millennial Tree Cookie and Fire Spirit Cookie, and some Cookies previously banned had their bans removed, such as  Peach Cookie and  Dino-Sour Cookie.

Deprecated Mechanics
Like Escape from the Oven, this episode originally contained Mystery Boxes and Mini Cookie Jars. Because of the unusual maps, Mystery Boxes could be found flying normally in some places and completely stationary in others. Mystery Boxes could contain a Mystic Jewel. After five Mystic Jewels were collected, they could be exchanged for a random reward from a Reward List, in a fashion very similar to the Mystic Jewels in Champions League. Mystic Jewels were rarer than they were in Escape from the Oven. Before Millennial Tree Cookie's release, the Legendary Pets were the only special rewards.

The Season 4 update in July of 2019 brought about a revamp to Breakout Mode. Mini Cookie Jars and Mystery Boxes, and by extension Mystic Jewels, were removed and replaced with Light Spheres and the Breakout Shop. The updated version of the City of Millennial Tree did not last long, as in December of 2019, it was replaced with the returning Escape from the Oven.

Stages
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1. Temple of the Millennial Tree
An outdoor stage against a blue sky background, with a giant tree rooted to the roof of a temple. The floor is made of thin platforms, and the stage starts with a large ramp upwards and then a fall through a thick path of Giant Bear Jellies, showing the vertical nature of the episode. This is an easy stage that starts with stationary obstacles, but transitions to small pits that vines slowly grow out of. Some midair obstacles shake before falling, and walls fall behind the Cookie or move out of their way. Rainbow Bear Jellies are plentiful and show where to jump. Two-thirds in, there is a small Potion. The stage finale is another tall ramp that leads to a midair Potion and a path of Rainbow Bear Jellies down, and after a flat, safe area with a large Potion, a springboard bounces the Cookie to the next stage.
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2. Sky Ladder
This stage begins with solid ground, but quickly the Cookie is running on midair moving platforms, bouncing between springboards, and avoiding a convocation of eagles. The background has no structures, merely water and sky, with a single vine-covered rock pillar sticking out of the sea. A quarter through the stage, the Cookie falls back to solid ground and avoids spiked box obstacles. They do not see solid ground again until the end of the stage, unless they fall down to the lower path, showing the episode's gimmick. Straying off the top path will cause them to miss a large Potion and the fall into the Bonus Time Jelly at the end of the stage.
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3. Silent Temple
This stage continues the mid air platforms and has Bonus Time Jellies that can be skipped to reach hidden Potions and replacement Bonus Time Jellies. There is a Potion near beginning, and springboard paths with spiky expanding obstacles constricting them. Obstacles fall and expand, and a row of Alphabet Jellies leads directly to a set of five Bonus Time Jellies. Avoiding them leads to a Giant Jelly, six small Potions, and an alternate access to Bonus Time. Next there are turning platforms, Yellow Bear Jelly Parties, and an upwards moving platform with enemies flying above it, leading to a Potion at the peak. There is a long Blast Jelly section with obstacles to destroy, and one of the obstacles has a Potion inside. Boarding a moving platform scrolls the camera up, and leads to a vertical line of Bonus Time Jellies, with two spots in the line replaced with Potions. Again, the Bonus Time Jellies can be deliberately avoided by passing through the Potions, leading to four more Potions and another Bonus Time Jelly.
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4. Altar of Starlight
This is a less forested area at night, with stars and the large full moon in the background. Torches are lit, and statues of Millennial Tree Cookie are more clear. There are tighter jumps among spiky obstacles, and near the beginning is a spring to a top path with Bear Jelly Parties and four Potions. In some sections, the floor is not there initially, and moves quickly leftward to meet the Cookie. There is a Blast Jelly, Giant Jelly, and Bear Party Jelly all together for a blast section, leading to a spring. The spring leads to three paths, the top or middle path both have Rainbow Bear Jellies but the top path has an additional Potion as well. the paths converge and quickly split again, with Rainbow Bear Jellies and two Potions up top. Near the end, there are brazier obstacles, and a springboard to Rainbow Bear Jellies and two Potions, then a wall of Giant Jellies and Bear Parties and a split path. The top path has a Potion and only Yellow Bear Jellies, while the bottom path has both Yellow and Pink Bear Jellies. Pomegranate Cookie's Trial uses this stage's assets.
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5. Altar of Starlight at Night
Despite the name, this stage has the same graphics and obstacles as the previous one. More brazier obstacles fall, and springboards with Rainbow Bear Jellies lead to a flat blast with plenty of Bear Jellies. Next, the Cookie has to jump down to lower platforms using Rainbow Bear Jellies as a guide. Falling early onto the last platform before the ground leads to a Potion placed right above braziers, so a double jump is needed. On the ground, more obstacles fall, and then there is a longer section with pits, small platforms, and the return of eagles. On the ground after this is a Potion nestled between box obstacles, and a safe rest section with some Power Jellies. The rest of the stage is small platforms and eagles, leading the Cookie upwards, and it ends with springs up to grab Giant Bear Jellies, then a spring down to grab Rainbow Bear Jellies and a Potion.
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6. Golden Cradle
The background changes dramatically to a golden wall with ancient carvings of legendary Cookies and Pets. The stage contains mostly Coins instead of other Jellies. It begins with a very flat section with spiked balls rolling or bouncing towards the Cookie, and the first spring leads to three Potions in a triangle shape. At the first split, the bottom path contains Rainbow Bear Jellies, and the top path contains Coins, both merge quickly. The Cookie jumps up spiked boxes following the Coin path high, then near the halfway point, a springboard bounces them into another, downwards pointing springboard, rocketing them down. After another short split path and a Blast Jelly, the Cookie needs to jump among small platforms and dodge the mysterious inhabitants of the temple. There is a Potion, and then the flat ground with spiked balls resumes. At the end are two more optional series of springboards and falls.
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7. Down the Golden Cradle
The original final stage keeps the obstacles from the previous stage and adds new ones, including snakes rising from baskets and sarcophagi, some of which open to reveal living inhabitants inside. There are segments with Coins, notably an early section with a screen full of coins above springboards, but there is a balance of Basic and Bear Jellies as well. The first split path is among moving platforms and Bear Jelly Parties. The top path has a shaky platform with a Potion, and both connect to the same large drop with thick rows of Jellies, but the top path gives a Magnet Jelly. On the lower level after a flat rest area is another split. The bottom path has an early Potion that can be collected from above with a strong enough magnet and basic jellies. The top path has Rainbow Bear Jellies. Past the halfway point is some flatter areas with some small, short split paths. Next is sections with multiple levels of falling floors. These continue through obstacles and to the large drop at the end of the stage.
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8. Vined Cavern
The first of the expansion stages is a cave with vine obstacles coming out of pots or the ground and the first boss-like enemy, a rock with a carved face and decorative torches. This stage is more like traditional LINE stages, as there are no major split paths and only two vertical scrolling segments, near the beginning and end. When the boss shows up, the floor, obstacles and even the Jelly trail are not initially present and need to slide into place, giving less time to react. There are no Potions until the very end of the stage, right before a platform that raises the Cookie up to the tunnel to the next stage.
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9. Down the Vined Cavern
After running through the tunnel, the Cookie falls down past a large mural of Millennial Tree Cookie. In this stage, water geysers lift the floor into position. There are green moving obstacles in the sky and mole enemies to charge through with a Blast Jelly. Blast Jellies continue through the stage. An early Potion is about a quarter in, and after the next blast the path splits, but they merge quickly with the blast speed. A long double jump at just the right spot off the end of the top path lets the Cookie grab a Magnet Jelly, bringing them Bear Jellies and a Potion placed out of reach. After running on geyser-raised platforms again, the path leads upward. Dropping below the highest platforms leads instead to a Bear Jelly Party with a large amount of Bear Jellies and a Potion. The paths merge and split again, with mostly Basic Jellies above and Bear Jellies below. Following the Giant Coins down farther leads to even more Bear Jellies, but causes the Cookie to miss the next Potion. The stage ends with more Blasts among Rainbow Bear Jellies. Pomegranate Cookie was originally unlocked by reaching this stage.
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10. Golden River
There is a green, starry sky above the river, and the surface of the water has a golden tint shared with the river's rocks and giant swans. This stage is even more simple than stage eight, lacking vertical scrolling and split paths completely. This does not mean it is easy, as there are many pits, spikes, and dangerously placed flying fish. Blast Jellies, Coin Magic Jellies and Giant Jellies help mitigate the obstacles. There is one Potion near the beginning, another about a third in, and a pair near the end. The stage ends with a Giant Jelly to break through a long series of spikes and then a large, foreboding gate.
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11. Cursed Throne
An elegant throne room with large chairs and a stained glass window in the background. The obstacles all reflect Pomegranate Cookie's curse, and are primarily black with red four-pointed star gemstones, like the ones on the Mirror of Malice. There are corrupted pillars, spikes, and vines. Statues of Millennial Tree Cookie have been modified to shoot rotating laser beams that typically need to be slid under. The final stage is difficult, but the many obstacles can enable a destruction ability to score well, and the frequent jumps between small platforms make the Bubble Gum Spring Jumpers useful. Yellow, Pink, and Giant Bear Jellies are common throughout. There are zero Potions which makes it very difficult to reach the end of the stage and cause it to loop, particularly during Season 4, when distance-increasing Treasures could no longer be equipped on multiple Cookies.
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Trivia

 * The Golden Cradle and Down the Golden Cradle stages have carvings in the background depicting Cookies, Pets, and Jellies. They notably have Cookies worshiping Millennial Tree Cookie, a checkered design of the Millennial Tree Bark Jelly, and Wind Archer Cookie as the  Guardian of the Millennial Tree. A mural shows the silhouettes of four Legendary Pets, Magmabird and Emerald Golem along with  and, who were not released at the time. They are connected with a question mark in the center of the group.
 * The previously released Carol Cookie and  Moon Rabbit Cookie had unlock requirements added when City of the Millennial Tree was introduced. Carol Cookie was unlocked from reaching Stage 4, and Moon Rabbit Cookie was unlocked from reaching Stage 6. All Breakout related Cookie unlocks were removed in Season 4.