Super fun game but killing the rabbit was next to impossible due to lag... I spent nearly an hour and would get close to killing him, only to have lag be my downfall. Finally managed to kill him and I've never felt more accomplished at the end of a game :)
I've found that the best thing to do at some point after lvl 16 "you have to open another window", refresh your main game page. You'll restart at the same level you were at, but you'll be reconnected to the server so once you win, you'll get the badge (this took me 3 tries to figure out...)
 "Bear in Super Action Adventure"){kind=icon}
 "This is the Only Level 3"){kind=icon}