Kal-Online

The story of 'KAL-Online'is based on oriental myth about the 74th war between Ha-Nin, the great king and "Ban-Go" who challenged the king with troops of demons. Features beautiful 3D graphics.

Free to play indefinitely.

Knight Online

This multiplayer game is cooperative, and has a player vs player option. Features good 3D graphics and a large world to explore. Character classes include mage, rogue, priest, and warrior. Client is a long download, but it's worth it.

Free, with option to pay for additional features.

KrabbitWorld

"Interactive dialogue with other players, Customizable characters with intriguing abilities (krabbilities!), Lush ethereal surroundings, Nightclubs and sporting arenas, Your own crib - A closet fulla goodies."

Free to play indefinitely.

Kung Fu Chess

"Dismantle the enemy defenses. Strike mercilessly! Real Time Strategy meets chess in a head on collision that will keep your adrenaline pumping!"

Free, with option to pay for additional features.