private void DeclareResourceManagers()
 {
     persistent = GameObject.Find("Training Grids").GetComponent <PersistentResources>();
     instance   = GetComponentInParent <InstanceResources>();
 }
    /* Disable AdjustDifficulty() when testing in the editor */
    /* Modify AdjustDifficulty() when making a build for resumed testing */

    private void Awake()
    {
        persistent = GameObject.Find("Training Grids").GetComponent <PersistentResources>();
        instance   = GetComponent <InstanceResources>();
    }