[albibak]

Search in the arcade.php :

$result_allgames = $DB_site->query("
		SELECT * FROM " . TABLE_PREFIX . "games 
	");

Replace by :

$result_allgames = $DB_site->query("
		SELECT * FROM " . TABLE_PREFIX . "games ORDER BY games.shortname
	");

And find :

$whereclause AND $sessionclause ORDER BY gamesessions.gamename DESC

Replace by :

$whereclause AND $sessionclause ORDER BY gamesessions.gamename ASC