Crystal Defenders is the tower defense game based on the Final Fantasy Tactics series from Square Enix. The game is very fun and easy to learn. In a nutshell, monsters will come in through one area and make their way down a set path. You job is to place characters along the side of the path to kill the monsters before they reach your crystal. You can place characters that do damage or slow the monsters among other things and you can pause the game in order to plan your defense.
The game itself has been on mobile phones for a few years now and was ported over to the PS3 and Xbox 360. Now the game is available for Android users. CRYSTAL DEFENDERS for Android will have two versions: W1, an introduction of the game, and W2, in which players can utilize the Power Crystal feature to play more strategically.
The cost of the game will be between seven and ten dollars. The pictures below are from the Ps3.