Subatomic Studios returns to iOS devices with Fieldrunners 2, the sequel to their award-winning, tower defense hit, available today for $2.99. In addition to 20 gorgeous, hand-painted defense levels, Fieldrunners 2 has puzzle, sudden death, and time trial modes to extend the game time.

This time, players can expect more levels that have pre-set lanes, as opposed to the open-field style from the original. Fieldrunners 2 also offers dozens of new weapons and towers and includes a single-use item system for desperate situations.

Fieldrunners 2 is available now on iTunes for iPhone 3GS and above devices. As reported earlier, Subatomic's Alec Shobin says the team is focusing on a native iPad version before bringing the sequel to Steam.

[Video via TouchGameplay]