Zen Studios has just told us that its Silver Award-winning premium Vita game CastleStorm will be available as a free-to-play experience on iOS and Android this spring.

Despite the fact it'll be a F2P game, CastleStorm for mobile will still boast four full campaigns (with 150 battles and four playable nations). Even the Castle Editor will be included in the iOS and Android editions.

If you're an Android gamer and want to try out CastleStorm's beta, by the way, you can sign up here for the chance right now.

In our review of CastleStorm on Vita, we said: "Mixing elements from Angry Birds, Swords and Soldiers, and the best tower-defence games, CastleStorm is the real deal for PS Vita."

Let's hope it's also the "real deal" for iOS and Android, eh.

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