I remember gunbound. God that game was fun. I was playing everyday, but then i suddenly stopped. Like maplestory, gunbound is only fun if you have friends to play it with. If you want an awesome game, try Gunz. Its a mmofps. All you do is enter a room, and kick the ass out of everyone in it using Bazookas(only available after lvl 12 i think) machine guns, pistols, rifles, swords, daggers, and kodachis. It's really fun but you tend to get annoyed when your on the high level servers and everyone is spraying(using machine guns, and just constantly holding the shoot button, and not even aiming.
Just get a few of your friends to play, and you'll be able to enjoy it alot.
Just google ijji or gunz.