Good news for fans of Crystal Siege (Free), the action/tower-defense game published by FDG that released last year. The game has been stuck on the iPad since its release, but FDG is releasing the iPhone version this week, and they’re going to make it a free universal update instead of a separate iPhone version. The update should be available on Thursday, April 30th. With the new update coming out, the game is on sale for $2.99 this week, so now’s a good time to pick it up if you’re interested.

I reviewed the game when it released, and found it to be a fun entry in the action/tower-defense genre that games like Kingdom Rush (Free) have pioneered. I am curious as to how the iPhone version will play, as there was no zooming on the iPad version. Will it be as good on the smaller screen as the big one? We’ll find out on Thursday.