public function isPlayable($subGame, $entry = null)
    {
        if (!$subGame) {
            return false;
        }
        
        $sortedPlayableGames = $this->getPlayableGames($entry);
        foreach ($sortedPlayableGames as $pgame) {
            if ($subGame->getIdentifier() === $pgame->getGame()->getIdentifier()) {
                return true;
            }
        }

        return false;
    }