Talk:Bloons Tower Defense 4 (Game)/Towers/@comment-168.9.42.206-20111107162846/@comment-4646728-20111201102214

You go to the ninjakiwi website, then click on the BTD4 New Tower No.2 then you will see the Spike Factory at the bottom of the tower selection. (The ninjakiwi website is ninjakiwi.com).