Anyone know a good free to play 2-d platform MMORPG?

[Evening]

I'd like to know some good 2-d platform MMORPG's but I can't seem to find one.

*Please don't tell me to join these 2-d platform MMORPG's.*

Wind Slayer - I've played this but the gameplay isn't smooth.

Maple Story - Horrible exp grind system and I'm not thinking of playing that again...

Grand Chase - Currently playing and I like it.

Gunbound - Great game but the North American server doesn't exist anymore...

Gunster - Doesn't exist anymore. I loved this game while it lasted...
(Japan server exists though. It's called Gunstrike.)