Zen Studios, the makers of Pinball FX, are working on a new 2D physics-based war game called CastleStorm, and you can win a free copy as long as your vocal cords are warmed up.

Anyone with a love for war or karaoke can enter to win some Zen Studios Slippers, or a few redeemable codes for CastleStorm and the next Pinball FX2 release. To enter, submit a link of your own CastleStorm music video using the below Karaoke trailer then send it to Zen Studios via email at CastleStorm@zenstudios.com or Twitter to @zen_studios. The contest is open until November 16, 2012 at 11:59 PM PST, and is open to people of all ages. We have a feeling that extra points will be awarded to those who dress up as Knights or Vikings.

CastleStorm is a medieval warfare game where Knights and Vikings meet in 2D physics-based combat. Players control the battle in real time, harnessing the power of medieval artillery, fearsome ground attacks, and powerful spells.

Check out the Karaoke trailer now. You won't get the full experience unless you sing it.