Following up on its well-received debut for iOS last year, Subatomic Studios' tower defense sequel Fieldrunners 2 has launched for Windows via Steam.

Fieldrunners 2 builds on the success of its predecessor with numerous new weapon types, improved enemy AI, and a 20-hour single-player campaign. The game also boasts new challenge modes, including a collection of Time Trial and Puzzle levels. Also, there's a tower that shoots beehives. That's pretty great.

Fieldrunners 2 is regularly priced at $9.99, but is available for $8.99 during its launch week.