|“||Had it not been for seismic serendipity unearthing it from its hiding place, the existence of the Colossingum might have remained a secret forever. Estimated to date back to the waning years of the Dawn of Fire, the provenance of its magnificent architecture is regarded to be the first-recorded instance of a Colossal spirit imbuing its life-force into an island. Evidence suggests that this was the site of rigorous musical training and friendly choral competition. Today, monsters are establishing a restored presence on the Colossingum, to resume their musical empowerment and to discover the secrets held within its ancient brickwork.||”|
|— In-game description|
The Colossingum is a unique Island where Monsters can train and compete in thrilling musical battles to win Monsterrific rewards. Teleport a selection of Level 5+ Monsters from the Natural Islands to the Colossingum, send them to the Conservatory for training, and sign them up for challenging Colossingum Quests to win big! More Monsters and a new Versus (PvP) mode coming soon, however, the Versus was released on December 4, 2020. It is quite like Composer Island.
The Colossingum has its own levels, that requires its own Battle Experience ().
- Mess Hall - Works much like Hotels, and acts similar to Castles in that you can tap and mute or alter the background track. There are currently twelve different background tracks to choose from that become unlocked as the Colossingum level increases.
- Conservatory - Train your monsters and make them stronger.
- Main article: Battle
Unlike any other island, the monsters do not sing, and all monsters are in idle animation; technically becoming a lot like Composer Island, which is also true because Thumpies uses Composer Island Thumpies' idle animation. Instead, The Colossingum is run by the Jukebox, playing the soundtrack “The Monster World” by default, but can be changed to a different soundtrack once higher levels are reached.
- This is the first island since Fire Oasis not to have the word “Island” in its name. It is also the first island since Composer Island to not include an element in its name.
- It is the first and so far only Island with a Nursery to not have a Breeding Structure.
- Initially, the Nursery could not be upgraded. This has since been changed.
- The Battle Theme is actually the pre-1.1.7 Loading and Market theme.
- The Natural Monsters and Seasonal Monsters aside from Gobbleygourd, Clavavera and Jam Boree are the only monsters on this Island.
- It is unknown if any more monsters will be added to Colossingum.
- If Gobbleygourd makes it onto the Colossingum, it is possible that Fire Monsters will be released as well.
- It is unknown if any more monsters will be added to Colossingum.
- There are costumes for Werdos Reebro, Humbug, Whisp, Kayna, Glowl, Flowah, Repatillo, the Dipsters, G'joob, Rare Bowgart, Noggin, and Furcorn, and Epic Toe Jammer and T-Rox even though they are currently not available on this island, which may hint that these monsters will be on this island as well as other Ethereals,Rare Monsters and Epic Monsters. or it may hint that more costumes will be released for monsters beyond the Colossingum.
- The Colossingum came out on September 3, 2020, during anniversary month in the 3.0.0 update.
- Its description points out that its existence comes from the Dawn of Fire, but nothing like it has been seen until today in the game. Besides, it is not possible to send fire monsters to the Colossingum.
- The song in the Colossingum varies and is chosen via the Jukebox in the Mess Hall as of Version 3.0.3, however, you can mute the song if you tap “mute” on your Mess Hall. This affects not only your island, but your friend's islands when you view them.
- As of 3.0.1, it is possible to move the Structures on the Colossingum without having to tap and hold them.
- This is the first island since Celestial Island where the Fire element is absent.
- The Starshop can be accessed through the mailbox during sales and promotions and when decorations are bought they stay on the island and give you 15,000 BXP each.
- There is a chance that you can still survive with 1 stamina during battle, even if your healthbar looks like if it's empty.
- If a monster is weaker, their stamina will be higher, if a monster is stronger, their stamina will go lower.
- For players that hadn't got the Colossingum, the guide gets you to access the Colossingum immediately and when the guide gets you to the 2nd stage of BUM-ble Beginnings, the guide will keep you on using the same weak move until they always get a defeat. A Level 7 Noggin will be used on that stage, meaning that the enemy is stronger than you. This has been changed as of 3.1.0.
- When you quit a battle during the second stage for the first time if your stamina is low, it is not possible to train your monster to a higher level until you get a defeat. This has been fixed as of version 3.1.0.
- The Colossingum's hieroglyphics - Main Article: Monstroglyphics - have told some history behind it and possibly the reason for the end of the Dawn of Fire.
- The first one states that 2 Colossals (possibly it and Tribal Island) had a disagreement on how to disrupt the monster's peace and stability, which may mean that the Colossals had staged an event at the end of the Fire age for an unknown reason that resulted in the age ending and them becoming islands.
- The second and third ones give some history behind the Colossingum, saying its Colossal felt individual training, conducted in a special environment and honing each monster's skills, was the answer. It found an abandoned landmass and imbued its lifeforce to it to make the Colossingum. This was a timely decision though, as it wasn't long before the Dawn of Fire age ended.
- The fourth and final one states the other Colossal instead used its lifeforce to make an island with an amber centerpiece and focusing in harmony. This is probably Tribal Island, as it focuses on harmony (tribes) and has an amber centerpiece in the middle housing the Kayna.
- When completing Power Plants, the monsters are able to train up to Level 15, and when completing Hard Rock Heavyweights, the monsters are able to train up to Level 20.
- This was the first Island without a unique song, until the introduction of the Jukebox.
- Technically, it would be Composer Island, but you can make notes for the monsters to sing, whereas here you can't make notes for monsters nor do they have any themselves.
- When losing a battle, the progression played is The Lick.
- When achieving victory from a battle, the progression played is a six-note fanfare.
- If the player exceeds the maximum level of The Colossingum, an overjoyed Furcorn will appear.
- The Colossingum and Shugabush Island are the only islands where Single Element Naturals cost Diamonds.
- The Colossingum, Wublin Island, Celestial Island, The Continent, Tribal Island, and Composer Island (Not including MSM Composer) are the only islands without variants.