Boolean extension in PlayerPrefsManager

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Insert it in your class as a helper class, and you could handle booleans with it.

class PlayerPrefsExtension
{
    public static void SetBool(string name, bool booleanValue)
    {
        PlayerPrefs.SetInt(name, booleanValue ? 1 : 0);
    }

    public static bool GetBool(string name)
    {
        return PlayerPrefs.GetInt(name) == 1;
    }
}

Here is an example:

public static void UnlockLevel(int level)
{
    if (level < SceneManager.sceneCountInBuildSettings)
    {
        PlayerPrefsExtension.SetBool(LEVEL_KEY + level.ToString(), true);
    }
    Debug.LogError("Tried to unlock a level not in the build settings!");
}