Driftology/Assets/Scripts/GameConstants.cs

using UnityEngine;

public static class GameConstants
{
    private const string CashKey = "Cash";
    private const string CarSelectedKey = "CarSelected";
    private const string CarUnlockedPrefix = "CarUnlocked_"; 
    private const string CarColorIndexKey = "CarColorIndex";

    public static int CarColorIndex
    {
        get => PlayerPrefs.GetInt(CarColorIndexKey, 0);
        set => PlayerPrefs.SetInt(CarColorIndexKey, value);
    }
    public static int Cash
    {
        get => PlayerPrefs.GetInt(CashKey, 0);
        set => PlayerPrefs.SetInt(CashKey, value);
    }

    public static int CarSelected
    {
        get => PlayerPrefs.GetInt(CarSelectedKey, 0);
        set => PlayerPrefs.SetInt(CarSelectedKey, value);
    }

    public static bool IsCarUnlocked(int index)
    {
        return PlayerPrefs.GetInt(CarUnlockedPrefix + index, index == 0 ? 1 : 0) == 1;
    }

    public static void UnlockCar(int index)
    {
        PlayerPrefs.SetInt(CarUnlockedPrefix + index, 1);
    }
}