The aforementioned imported files are unknown.

Unknown implementations

The given input is missing the check for the non-zero address.

Missing Input Validation

In the contract, `GameBreed`, the role, `_owner`, has authority over the functions shown in the diagram below.

Any compromise to the `_owner` account may allow the hacker to take advantage of this authority.
![](https://accelerator-tasks-prod.s3.amazonaws.com/617b8dc242474f6082db12420ac56a64/GameBreed-_owner.svg)

In the contract, `GameBreed`, the role, `admin`, has authority over the following functions.
- `breed(uint256 _ticketId)`
- `setTotalTribe(uint8 _v)`
- `setTotalProfession(uint8 _v)`

Any compromise to the `admin` account may allow the hacker to take advantage of this authority.

Centralization Risk in GameBreed.sol

The state variable, i.e. `totalTribe`, `totalProfession`, `rarities` should be greater than zero because of remainder operations.

Lack of Input Validation

Updating the value of `legacyNFT` would result in the old user losing NFT.
Example:
- Assume that `legacyNFT` is address(A)
- Alice calls the `lock` function with `_legacyNFTId` is `1`, then value of `nftOwner[1]` is Alice
- The owner calls the `setLegacyNFT` function updating `legacyNFT` as address(B)
- Bob calls the `lock` function with `_legacyNFTId` also is `1`, then the value of nftOwner[1] is Bob instead of Alice, as a result, Alice is unable to get back the NFT.

Side-effect of updating the contract address

In the contract, `MysteryCardRedeem`, the role, `_owner`, has authority over the functions shown in the diagram below.

Any compromise to the `_owner` account may allow the hacker to take advantage of this authority.

![](https://accelerator-tasks-prod.s3.amazonaws.com/617b8dc242474f6082db12420ac56a64/MysteryCardRedeem-_owner.svg)

In the contract, `MysteryCardRedeem`, the role, `admin`, has authority over the function `redeem(uint256 _legacyNFTId)`.

Any compromise to the `admin` account may allow the hacker to take advantage of this authority.

Centralization Risk in MysteryCardRedeem.sol

The linked statements do not affect the functionality of the codebase and appear to be used for debugging.

Redundant Statements

ElementX

contracts

MysteryCardRedeem.sol

GameBreed.sol

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