Today's Free App of the Day is the highly rated UniWar HD (Over 4 stars out of 5, 18 reviews)

First released on the iOS platform, UniWarHD can claim:
• Over 1.9 million games played and counting
• 2011 Best Multiplayer Game Award: 2nd place
• 2009 Best Multiplayer Game Award Nominee
• 2009 Best Strategy Game Award Nominee

In iTunes, the game has 124 reviews with a 4+ out of 5 rating.

From the game's product description:
UniWar is the online multiplayer turn-based strategy game for the iPhone. Players take turns building their army and fighting against each other using the strengths of their units while taking advantage of the terrain. It is like chess or checkers but with a lot more possibilities and different boards.

Normally $4.99, free today!