There are many games for the iPhone and there are quite a few tower defense games. None of them are quite as nice as Fieldrunners. There are several maps, several modes of gameplay, and many different strategies. I am posting the strategy that I used for beating the Crossroads classic map on easy. I tried really hard to get it done perfectly, but as of now I only have let a single soldier slip through.

Basic logisits:

• Concentrate your teslas in a 5×5 square in the center to maximize air support
• No need for combined paths until later in the game (round 73)
• Every tesla that you place must hit both paths of soldiers
• NO ENDLESS LOOP CHEATING!!!