ManaPlus is a sister project of The Mana World and the default game client.
In order to play TMW you need to register a game account and download, install and run ManaPlus.
We supply a self-fork optimized for playing The Mana World, however, you should still be able to download the original client as well.
If you cannot or do not want to use our fork, you can
Note: If you have problems while registrating or troubles to get our Manaplus fork running please contact us. Please bear in mind that we do not provide support for the non-forked version; Contact ManaPlus Developers if you need support with it.