Zen Studios' hybrid tower defense game and physics puzzler CastleStorm is making its iOS and Android debut later this spring as a free-to-play game.

Rechristened CastleStorm: Free to Siege, the upcoming mobile port features four playable nations, each of which boasts its own campaign across a total of 150 included levels. Free to Siege includes new spell types not seen in the game's previous console and Steam releases, and offers a redesigned control scheme suited for touch screens.

Players looking to join the siege early can sign up for a private beta on Android platforms.

[Image: Zen Studios]
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CastleStorm – Free to Siege Coming Soon for Mobile Devices

Open Beta Now Available for Android Users

CastleStorm is coming to mobile devices! The mobile adaption of the game will be free to play and offers players an incredible amount of content and exciting features that made the game a success on console and PC platforms.

Featuring console quality graphics and controls tailored for the touch screen, CastleStorm – Free to Siege includes four full campaigns with 150 battles and four nations with distinct troop classes, weapons, spells, bonus rooms, eight playable hero characters as well as brand new spells for the mobile version!

Players with Android devices interested in getting their hands on the game early are invited to participate in a private beta starting today. To join the beta, join the CastleStorm – Free to Siege Google Group by visiting http://www.castlestormgame.com/freetosiege/, opt-in to the CastleStorm Beta on the Google Play Store and then download the CastleStorm Beta. Community feedback can be submitted via the Zen Studios Forums. Space is limited so join today!

"CastleStorm - Free to Siege is Zen's first step into the free to play world. We have been watching, learning and planning our steps carefully so we do this right," said Mel Kirk, Zen Studios Vice President of Publishing. "This beta period is extremely important to us and we really look forward to community feedback as it will certainly shape the final game."

CastleStorm – Free to Siege will release on iOS, Google Play and Amazon later this spring.

This article was originally published on Joystiq.