Okay, to play World of Zoo you'll need the Wood R4 for Clones firmware. There aren't any patches for World of Zoo, and Wood R4 is the only way R4 users will be able to play the game. Wood R4 also fixes other games like Bejeweled Twist, Jam Sessions 2, and Assassin's Creed II. It's highly advised that you get this firmware. http://gbatemp.net/index.php?showtopic=221023
So, I downloaded it but where do i put the Wood.NDS and _rpg file? In my R4Menu folder, moonshl2 folder? I;m really confused! =)