Very easy game play, i try and kill every one the moment they step into the map using one machine gun burst. Numbers would most definitely help as well, telling us exactly what it did.
I was playing this on my laptop (Not the newest thing, 1998 I think) And it would randomly skip a level now and then. It was kind of laggy but I would press next level and it would give me another 100ish and thats it....
 "Frontline Defense Beta 2"){kind=icon}
 "Exploit"){kind=icon}
 "Bloons Tower Defense 3"){kind=icon}