Nine Over Ten 9/10 has put up a review for LambdaMu Games latest offering on the iPhone/iPod touch, 4Towers. This Tower Defense game shares some graphical similarity to GeoDefense, but what separates 4Towers from the rest of TD games on the iPhone is its unique gameplay.
There are fixed tower placements in each level and players can pair up basic tower types to create even more powerful towers, opening up different strategies to deal with various kinds of creep.
The game also features double social gaming networks with both OpenFeint and Game Center providing online leaderboards and achievements.
Additionally, the developers are currently releasing episodic content containing additional levels for free, increasing the replace value of the game.