This is the multiplayer action RPG Graal, Quest on your own or join one of the many player-built guilds.
Java players cannot see DirectX players (graalonline.com network : http://www.graalonline.com, but you can play all most levels of the DirectX version. Of course there are some limitations: you don't see bombs, npc's or chests. You also cannot share items with other players or pull stones. But you can still shot arrows, lift&throw bushes, use your sword and push stones.
movement: arrow keys, numpad or 'IJKL'
lift bushes: 'A'
sword: 'S' or space bar
shoot arrows: 'D'
change your nick name: type in "nickname: " in the chat field