For the badge junkies like me: The fastest way to get the medium badge is to play on a 6tick/hour server, and check it about twice a day to build as many buildings as you can. Build the resource buildings first. Don't worry about defenses, they don't matter if you're just trying to get the badge. After about 3 or 4 days you will have all the buildings and the game will somehow seem more interesting. ++ So others know!
The medium badge should really be checking to see if you have full color mode unlocked. I easily reached 50 MPH again and it did nothing, so I'm not sure what is going on...
This one is pretty easy: Always wait for the tower to get 2 blue spots and one green one. Then stick 2 linkers and a fork. A couple towers like this will clear the field without any problem. + so others know!
Why is everyone giving a "minus" to all of the comments about the lag? Lag is what is keeping this game from being great! You're more likely to die from lag than from anything else!