Underground Labyrinth

The Underground Labyrinth (地底迷宮, Chitē Mēkyū, Underground Labyrinth), or The Grand Deep (グランドアビス Gurando Abisu, Grand Abyss) is a time-limited game mode that was added in Version 12.0. It is unlocked after Into the Future Chapter 3. It consists of 100 levels that the player can randomly challenge, and is one of the few sources of Dark Catseyes. Unlike most events, the Underground Labyrinth is accessed from its own button in the Main Menu, rather than being part of Legend Stages.
==Overview==
Underground Labyrinth is somewhat similar to Legend Quest, being an event map that appears on an unknown schedule for a period of time and consists of a randomly shuffled assortment of stages. While players may choose any Cat Units they want for each stage, a random selection of the player's cats become "trapped" when stages are won or lost, rendering them unusable within the Underground Labryinth for the remainder of the event. Once the event period is over, players will be ranked and receive rewards based on stage progress and units remaining, similar to the Arena of Honor.
==Mechanics==
The player must equip 10 units before attempting any stage in the Underground Labyrinth. The enemy preview will show what enemies are in the stage rather than the usual question marks for new stages. If the player clears the stage, then a certain amount of their units will be "trapped", meaning they cannot be used on subsequent stages. There is also a 60% chance upon clearing the stage that a trapped cat unit can be "rescued"; the rescued unit can be chosen by the player and will have their trapped status removed.
If the player loses or exits the stage, then two units used will be trapped. Units trapped in this way cannot be rescued. Since the player must equip 10 units before attempting a stage, they must also swap out the trapped units. Additionally, equipped units become locked in your line-up after a stage is attempted, remaining in this state until they become trapped or the challenger can no longer progress.
==Randomization==
===Trapped Units by Layer===
Layer 	Units Trapped
1 ~ 911 ~ 1921 ~ 29 	3 ~ 5 Each81 ~ 135 Total
31 ~ 3941 ~ 4951 ~ 59 	4 ~ 6 Each108 ~ 162 Total
61 ~ 6971 ~ 7981 ~ 8991 ~ 98 	5 ~ 7 Each175 ~ 245 Total
Every 10th floor and 99th floor	7 ~ 9 Each77 ~ 99 Total
Without factoring in losing or quitting stages, the number of trapped units in a complete run of the Underground Labyrinth can technically be as low as 341 (minimum traps and 100 rescues) or as high as 641 (maximum traps and 0 rescues). Realistically however, the total number of lost units will hover somewhere around 481 (average traps, 60 rescues) with higher or lower losses than this becoming exponentially less probable to the point of statistical impossibility.
===List of Stages===
Due to the difference in possible stages (113) and used stages per event (100), a total of 3 Floor 10 stages, 2 Floor 20/30 stages, 3 Floor 40/50/60 stages, 4 Floor 70/80/90/99 stages, and 1 stage between 51 ~ 98 (excluding multiples of 10) will go unused in each Underground Labyrinth.
==List of Floors==
Each stage has a drop reward as listed in the table below. The rewards drop at a 100% chance on the 99th floor and floors that are multiples of 10, and a 50% chance on all other floors.
==Ranking Rewards==
Upon clearing a stage, the player will receive a certain amount of points. The goal is to maximize the points received, as these will determine rewards, similar to how in the Arena of Honor higher percentiles reap higher rewards.
Ranking	Title 	Rewards
1~5% 	Platinum Medal (プラチナ勲章, Purachina Kunshō) 	Dark Catseye x5
6~15% 	Gold Medal (ゴールド勲章, Gōrudo Kunshō) 	Dark Catseye x4
16~25% 	Silver Medal (シルバー勲章, Shirubā Kunshō) 	Dark Catseye x3
26~35% 	Bronze Medal (ブロンズ勲章, Buronzu Kunshō) 	Dark Catseye x2
36~50% 	 	Dark Catseye x1
51~75% 	 	Legend Catseye x3
~100% 	 	Legend Catseye x1
==First Appearance==
===Japanese Version===
*December 6th, 2022 to December 26th, 2022
===Global Version===
*February 20th, 2023 to March 13th, 2023
==Trivia==
*Most of the files for the Underground Labyrinth were added in Version 11.10, where there were 104 total stages including placeholders. Additionally, they were completely blacked out to prevent any spoilers.
**3 stages were later removed in Version 12.0, leaving 101 total stages as a result.
**Version 12.2 added 11 new stages to the Labyrinth.
**Version 12.3 added 1 new stage and the map name for 1 new floor.
*The first music track exclusive to the Underground Labyrinth sounds similar to "Monsters in the Dungeon" (also known as "Deep Underground") from the Dragon Quest V soundtrack.
*Grand Mage Mimon's description reveals that she is the one who traps units in the Underground Labyrinth, forcing them to listen to her long, rambling stories about her big brother.
==Reference==
*https://battlecats-db.com/stage/s33000.html
Category:Event