Here is a top 5 browser game list in my opinion. Sorry for the messed up links of pix, just copy n paste if u wanna see

#1) Runescape
www.runescape.com



#2) Sherwood
www.maidmarian.com
http://www.image.blog.livedoor.jp/topics_collector/imgs/4/6/469e3140.jpg
#3) Habbo Hotel
www.habbo.com

#4) tbadventure
www.tbadventure.com
http://tbadventure.com/screenshots/1.jpg
#5) Battle Dawn
www.battledawn.com



///EDIT///

Here's another game I forgot to add, sorry top 6 I guess ^^

www.slavehack.com