Thanks to the addition of in-app purchases, Trendy Entertainment has made the Android version of Dungeon Defenders: First Wave free-to-play. The updated version of the hack-and-slash, tower defense hybrid game will allow Android users to purchase "pets, armor, equipment, and a host of other in-game items," and it's available now on the Android Market.

Trendy has also updated the iOS version of the game, which is now optimized for iPad 2 (though the app is still universal). To celebrate, the game has been discounted to $0.99 for the next week. Check out a video of the iPad 2-optimized Dungeon Defenders after the break.