# Loot Box System

Users will have the chance to receive a loot Box when a game finishes.

**It is possible to receive multiple types of rewards from one Loot Box.**

The chance and grade of the loot Box is decided by a NFT character’s Luck attribute.

Users may wait until cool down time is finished and open up the loot Box at base cost.

Or they can use the boost service to open up a loot box immediately.

Possible rewards in the loot Box are: [MCC](/whitepaper/tokenomics/mcc-utility-token.md), [Gems](/whitepaper/gamefi-elements/gems-and-gem-sockets.md), Bonus [Energy](/whitepaper/gamefi-system/energy-overdraft-system.md), [Treasure Hunt](/whitepaper/gamefi-elements/treasure-hunt.md) vouchers.

Users can hold up to 4 unopened loot Boxes simultaneously. 

If a user receives a loot Box when he already has 4 unopened loot Boxes, he will be asked to either abandon it or open it immediately using the boost service.

Below are the numbers and chances related to the Loot Box.  It is possible to receive multiple types of rewards from one Loot Box. 

The chance to receive different levels of gems from a Loot Box：

| Loot Box | Lv1 Gem   | Lv2 Gem | Lv3 Gem | Lv4 Gem | Lv5 Gem | Lv6 Gem | Lv7+ Gem |
| -------- | --------- | ------- | ------- | ------- | ------- | ------- | -------- |
| Lv1      | Medium    | Slim    | N/A     | N/A     | N/A     | N/A     | N/A      |
| Lv2      | Medium    | Slim    | N/A     | N/A     | N/A     | N/A     | N/A      |
| Lv3      | Medium    | Low     | Slim    | N/A     | N/A     | N/A     | N/A      |
| Lv4      | High      | Low     | Slim    | Slim    | N/A     | N/A     | N/A      |
| Lv5      | High      | Low     | Slim    | Slim    | N/A     | N/A     | N/A      |
| Lv6      | Very High | Low     | Slim    | Slim    | Slim    | N/A     | N/A      |
| Lv7      | 1X GTD    | Medium  | Low     | Slim    | Slim    | Slim    | N/A      |
| Lv8      | 1X GTD    | Medium  | Low     | Low     | Slim    | Slim    | N/A      |
| Lv9      | 2X GTD    | Medium  | Low     | Low     | Slim    | Slim    | N/A      |
| Lv10     | 3X GTD    | High    | Medium  | Low     | Low     | Slim    | N/A      |

Note 1: Multiple Gems may be rewarded from one Loot Box.e.g. 2X LV1 + 1X LV2

Note 2: 0.1%-5%=Slim, 5%-20%=Low, 20%-50%=Medium, 50-70%=High 70%-99.9%=Very High,

100%=GTD

Besides Gems, Users may earn up to 6 bonus energy from one Loot Box and MCC may also be rewarded randomly. 

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