Mabinogi

Mabinogi is a game loosely based off of Irish mythology allows you to explore, fight monsters, and learn life skills (seriously). There are many secrets in the world of Erinn, waiting to be discovered.

Nekojima
uECGU0B5JsE Also known as "Cat Island", it was an exclusive event island that was only for Japan. Yet for some reason, the map exists in the US version and the only way in involves glitching.