Castle (From RoH to IoX onwards)

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### Islands

Natural Islands, Ethereal Islands, Magical Islands, Medieval Islands, Xalaikhan Islands, Primitary Islands, Technicary Islands, Gold Islands

## Structure Details

### Upgradable

Yes

> "*This Castle is where all the Monsters go to sleep at night. Each type of Monster needs a different number of beds. Keep upgrading so you can have more Monsters on your Island!*"
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## Description

The **Castle** is a Structure that allows for Monsters to be placed on an Island - each castle provides a certain number of beds for monsters. Aside from Gold Islands, Outer Islands, Wublin Island, Superethereal Island, and Celestial Island, each island starts with the same Basic Castle and the progression through the castles is the same, with the same number of beds for each level of castle, but the time and cost required and experience granted for each upgrade differs based on the island. The Gold Islands has a single castle - the Crystal Castle - which does not have a bed limit, and cannot be upgraded.

There are two mini-games that you can play from the Castle, and a third introduced in ABD onwards; you can learn more about them by clicking on the links below:

* Spin Wheel
* Memory Game
* Switch-Swap-Catch n' Cook

## Song

The upgraded Castle (i.e. any upgrade that is not the Basic Castle) produces an electric bass sound. This does not happen in Gold Island as the Sneyser replaces the Castle's musical role. In Fire Island and Psychic Island, it plays a bass/sub-bass synth. In Faerie Island, it plays a baritone synth.

## Castles

### Common Castles

In the following table, the number of beds shown is given as the number on all islands except Ethereal Island and the Xalaikhan Islands, followed by two slashes and the number of beds on Ethereal Island and the Xalaikhan Islands.

### Crystalline Castles

Crystalline Castle upgrades were added in the 2.4.1. update of MSM 1 and are only available on the Natural Islands, Ethereal Islands (From IoX onwards), Magical Islands and Xalaikhan Islands (From IoX onwards). These upgrades allow at least one of each monster to be on the island at once. And the bed space at maximum is 180. Each castle is unique, sporting the color and features of the island, as well as the element it represents. They also have the crystals from Dawn of Fire (when the islands were simply the elemental lands of the continent) and from the Ethereal Islands and Xalaikhan Islands in IoX onwards on the top of their pillars. It was also stated they were built using those crystals. Each castle has the crystal they had for the elemental lands the island represents: Plant island’s crystalline castle has vegidian crystals, Cold island’s has frozium, and so on, from IoX onwards the Ethereal and Xalaikhan Islands have Crystalline Castles too due to the amount of Monsters their Islands have + Rares and Epics. The order from bottom to top of these crystals is 3 natural crystals, (first seen level 1) 2 polished crystals, (first seen level 2) and 1 carved crystal. (level 3) each islands crystalline castle costs 20 more diamonds than the last islands castle, and each next level costs double the current level. (Plant Island’s castle takes 80 diamonds for level 1, 160 for level 2, and 320 for level 3. Cold Island’s take 100 diamonds for level 1, 180 for level 2, and 340 for level 3. This keeps going up throughout the islands)

### Other Castles

Some Islands' Castles cannot be upgraded and are already at maximum.

 File:Crystal Castle.png | **Crystal Castle**
"*Although shaped like a castle, this mysterious structure actually serves as the main power generator in the monster dimension of the multiverse!  It's from here that monsters derive their musical inspiration, as well as their tireless energy so that they can keep singing forever!*"
 File:Composer Castle.png | **Composer Castle**
"*The Castle on Composer Island is styled after another famous Structure in the Monster World, but the similarity is more than skin deep! Just as the Crystal Castle serves as a power generator for Gold Island, the Composer Castle acts as a powerful transmitter for the creative energies flowing in from the human universe - it's go some of the Seam's best upload/download speeds!*"

*Note: Monsters on Composer Island only take up 1 Bed except the Glowbe, meaning a total of 80 Monsters can be placed, while Glowbes, infinite.*

## Upgrade costs

Cost and time to upgrade the Castle varies by Island.

## Notes

* The castle on Gold Island does not produce any bass sound. Instead, Sneyser produce a bass sound.
* For a long time, there was a hint of a new castle being added. The hint could be viewed from the log-on screen hints and tips. It said, "The Extravagant Castle is the Maximum Castle. For now."  This hint has now been realized in the Paradise Castle.
* Costs for Extravagant and Paradise Castles in Water and Earth Islands increased after the Anniversary Month Celebration ended in 2014. Instead of each of the Extravagant Castles costing 30 File:Diamond25px.png, they now cost 35  in Water Island and 40  in Earth Island. The Paradise Castles cost 70  and 80  respectively.
* The castle on Composer Island is a Paradise Castle with unlimited beds. However, all monsters in the Composer Island, except the Glowbe occupies one bed. (Glowbes occupy zero beds)
* Although the game states that Monsters sleep in the castle, they do not go to sleep by themselves, and when muted do not go into the castle.
* The Crystalline Castles were added to the game on June 3rd, 2020. They are based off of the Crystals from Dawn of Fire. The Crystalline Castles are likely not called Crystal Castles to avoid confusion with Gold Island’s Crystal Castle.
* In IoX and onwards, the Ethereal Islands and Xalaikhan Islands have Crystalline Castles due to the amount of Monsters on each Island + The Rares and Epics. Notably the beds in the Castles starting from RoH onwards have increased to accompany the major increase in the amount of Monsters due to the additional element from the main breedable element of the specific Island, similarly the cost to upgrade the Castle in Fire Island has increased greatly to compensate for Fire Haven turning into the sixth Natural Island and each Natural Island's Castle upgrade costs more than the last Island's Castle did.

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