Sorry but I already quit the game after the 1st wave
This game is Hopeless.
Here's the problem
Once you get enough fully upgraded sniper towers, it's impossible to lose. Right now I'm on wave 81 (sissy mode) with 40 fully upgraded sniper towers, and the only thing that's changing between levels is how long it takes for my towers to kill everything. Once you get to that point, the game's pretty much self-sustaining.
Also, you misspelled quadruple.