This is a walkthrough for the video game Fieldrunners. This page covers the level "Frostbite" and how to beat the challenges.

This is the last map. There are four entrances to this map, one to the North, South, East and West. Your enemies will be trying to enter your base that is located in the center of the map. The first thing you'll notice is that your ooze gun has been replaced by an ice tower. This serves a similar function to the ooze gun of slowing down your enemy but attacks all enemies in a radius instead of one enemy at a time.

Because there are four entrances be very aware of where your opponents are coming from each round. You don't have the luxury of placing a lot of unnecessary equipment. Therefore place a tower and wait to see the effectiveness before placing a second or third. You want to eventually create a maze that links all the entrances into one corridor.

Starting at round 10 aerial units will start attacking. You should be capable of holding them off using just machine guns until round 15. Work on upgrading your machine guns instead of deploying more for the first 20 rounds, this will increase your firepower and save your cash reserves for the future.

The first major challenge comes at round 48, here a group of helicopters will fly in from the north side. The only way you have enough time to stop them is by using lightning towers. This is a portent for the future, you want your kill zones to be in front of all four entrances. This is because aerial units will be your main threat. By the end of the game you should have two rows per entrance that contain one fully powered ice tower and two fully powered lightning tower. That should be enough to hold off any aerial assault.