<aside> ℹ️ On MCC Island, there are many different gameplay mechanics that involve randomized pools of rewards, with varying odds for each item within those pools.

This article shares the exact percentage-based chances for each reward.

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Last updated August 18th, 2025 for Patch 0.25.2. If there have been any changes to these systems since, certain information in this document may be outdated, and is pending an update.

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Openables

Openables are items that can be interacted with through the player's inventory.

All Openables use a system of Loot Pools and Rolls to determine what they contain. When opened, an openable will make a number of Rolls, depending on the openable type, and then reward an equivalent number of items.

A Roll has a list of Loot Pools, with a different chance for each pool to be chosen.
A Loot Pool contains a list of Items, with a different chance for each item to be chosen.

Material Crates

There are 4 types of Material Crates, with the only difference between each of the four being what type of material they give.

For example, Oceanic Material Crates give Oceanic Materials, but Magical Material Crates give Magical Materials.
So, each Material Crate has 9 rolls for Materials from its corresponding type, but the rarity of each of these materials is random.
Chances for each rarity can be seen below in the material_oceanic loot pool for Oceanic Material Crates, and so on.
Each Material Crate also has 1 roll for Gloop. Chances for the different amounts can be seen in the material_gloop loot pool.

When rolling for Materials, each of the 9 rolls has a

96% chance to be a normal material, matching in type with the crate.
4% chance to be a Power Shard, common to legendary in rarity.

Additionally, each Material Crate has a 0.1% Chance (1/1000) ****to contain a Material Singularity, as a bonus separate to the main rolls.

Reward Crates

There are 6 rarities of Reward Crates, ranging from Common to Mythic.

Each Reward Crate gives a range of Coins based on rarity. All values in the range are equally likely to be chosen.
Additionally, each Reward Crate contains a certain number of Item Rolls, from a certain Loot Pool.

Reward Crate Rarity	Coin Range	Item Loot Pool	Item Rolls
Common	500 - 1,500	`rc_item_low`	1
Uncommon	1,000 - 3,000	`rc_item_low`	2
Rare	3,000 - 7,000	`rc_item_medium`	1
Epic	5,000 - 15,000	`rc_item_medium`	2
Legendary	20,000 - 40,000	`rc_item_high`	1
Mythic	40,000 - 80,000	`rc_item_high`	2

Contents

Openables

Material Crates

Reward Crates