Here's an idea for the spike factory tower, click to select where the spikes are set. Click four different locations on the map in the spike factory's range to make the spike factory place it's spicks there.
Day 36. Still no signs of friendly life outside the house, infinite ammo still infinite, or to say at 43 googles, mechanical marines or mechs released a day ago, the chaingun nicknamed "Old Glory" fully researched to full attack potential. Still holding out well... 98 gunners, and 11 repairmen, me, and the men and women of the house.
Use "Spitfire", reload, while reloading use "Minigun", reload, while reloading use "Spitfire", reload, while reloading use "Minigun", reload, while reloading use "Spitfire", reload, while reloading use "Minigun", reload, while reloading use "Spitfire"...
LAWL!!! I placed 4 mines really fast and the game froze! So I started to build my car to 99%. Then I found an un-dead frozen zombie, so i decided to walk up to it... the game unfroze!
 "William and Sly 2"){kind=icon}
 "Bloons Tower Defense 4"){kind=icon}
 "Elephant Quest"){kind=icon}
 "Bloons Tower Defense 2"){kind=icon}
 "Scribble!"){kind=icon}
 "Storm the House 3"){kind=icon}
 "Dude and Zombies"){kind=icon}