Talk:The Skill Tree/@comment-5294711-20130306110634/@comment-5971321-20130306112350

Well... 2 things.

1. I wanted ranks to do something more than just... Well... Unlock towers and upgrades. Also, this encourages people to use all sorts of towers to level them up.

2.I think that BTD should have something that permanently affects the game positively the longer you play it. The only difference you get for playing longer is unlocking more towers and upgrades and tracks, and that doesn't take a long time to do. But BTD does do that with BTD5 ios though, with the monkey lab.