"Dynamite inmate just cleared my guards leaving no defenses and no money" => The point of the game is to make sure the dynamite can't clear your defenses or at least to make sure you have enough money to rebuild. It's about making the right tactical decisions. Place fences and sell them at the right time to guide the inmates though your grid of towers. It is possible to get to level 7 without having even one inmate escaping. Also, you can't place towers to close to each other or to the edge of the field. One last warning: if you place your fences in such a way that inmates can't reach the exit, they will attack your fences. Use guards against the inmates with the dynamite but not against the inmates with the guns (they shoot the guards). Use fire or missile towers against groups of inmates. Save your cash! You might need to rebuild fast.