While I generally do flash walkthroughs, I fell in love with TapDefense for the iPhone. The game has all the greatness of a flash game, but I can play it on the subway. I believe it is a win win situation here!
So far, I have focuses on classic mode, because why change the classics right?
Easy
I found that arrow towers are actually useful in this game. I bought mostly tower defenses in the beginning. Only invest what you earn in interest. I would build two arrows and upgrade one to the second level. Then I would buy another arrow until I make enough to upgrade my current towers. When the enemy starts running away from my defenses, I would invest in water tower. For the halos, I would invest in interest twice. Then, I invested in magic and started building magic towers. Again, unless in trouble, never invest more money than you make! repeat until level 43 in which all hell breaks lose. I had enough magic and arrow towers to take care of the day though!
Medium
Here, I would alternate between building arrow and cannon towers. For each bend, when money was available, I invested in water towers. The first two halos go towards interest. The next available halo goes towards ice towers. I put several ice towers in the front of the gate to avoid enemies running through my towers. The next available halo goes towards magic towers. When I beat medium, I invested in the next two halos in earthquake and made that as powerful as possible. If I were to do it again, I would of invested in interest as the last round you get two halos for the onslaught of enemy. The interest rule still applies so do not spend more than your interest can handle.
Hard – PENDING