Free To Play?

YES!

DFO is completely free!

http://dungeonfighter.nexon.net/

Go to that address, register a free Nexxon NA 'passport,' and download the game client.

This is all free, and the game is technically still in Open Beta; a testing period before official release. The publishers, Nexxon NA, who also publish Maple Story in North America, have what is called a Cash Shop system.

Cash Shop? I thought it was free....

To play the game IS free, but certain services and features are unavailable without Using Nexxon points to purchase them. The ability to upgrade your Safe Storage, Open up a TradeStall, and acquire clothes for your avatar (which also boost stats), require the use of Nexxon points (Nx). Although Avatar clothing can be purchased from other players with in game money.

Nexxon Points can be found in $10 and $25 game cards at walgreens, 7-11, and Target. You can also charge nexxon points online with a credit card, but there are restrictions on using Nx purchased in this way.