The paid version of the game has five different maps and unlimited difficulties, while the free version comes with only one map and 11 difficulties and doesn't allow the player to save in-game progress. The game has two different versions, the paid version and the free version. The game was released for Android on 16 September 2009 by Lupis Labs. These towers have multiple variants which could be obtained through upgrades.

The slow tower, on the other hand, could only slow down enemies. The machine gun and rocket towers, also known respectively as the blue and yellow towers, could shoot down both land and air attacker. Meanwhile, the turret tower has three different types. The land attacker enemies would follow the route made by the placement of turret towers, while air attacker enemies would went straight ahead for the other end, ignoring the presence of turret tower. There are several different of enemies and turret towers. If the health bar goes down to zero, the player loses the game. The player would lose a health bar for every enemy that managed to pass to the other end of the map. Killing an enemy generates in-game cash for the player, which in turn could be used to buy and/or upgrade turret towers. The player may obstruct the enemy's path by making the route longer through the strategic placement of turret tower, but the player is not allowed to block the enemy's path. The player could upgrade the tower by clicking the turret tower and choosing one of the upgrades available. After clicking a tower, the player could drag it into the field of play. To do this, the player must buy one of turret tower displayed in the bottom right corner of the screen by clicking on it. The player must place down towers in order to obstruct the path of enemy. After a few moments, the enemies, in the form of little infantry troops, would start appear. Īfter selecting the desired level of difficulty and map, the player start with an empty field/track. The game has only ten different difficulties in the beginning, but new level of difficulties would appear after the player finished the maximum level of difficulty. The player would then be sent to the 'select difficulty' screen, where players can choose their desired map and level of difficulty by clicking the top and down arrowhead. The game could be started by pressing the new game.

Robo Defense is a real-time strategy tower defense game with five different maps.

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