This game gives itself way too much credit by giving you somewhere in the area of 8 and a half minutes between levels. At first it may seem like an advanced game but, in a minute you'll realize a six year old could beat it, " Sooooo where does the red add-on go? is it the blue or the red add on spot????" The icing on the cake is once you speed the game up "3x", the fire rate ratio does not meet up with how fast creeps spawn. BOO THIS GAME!