Survive through each unique world by preventing bugs and other enemies from passing in Worlds Guard Tower Defense. Strategically place robotic defenses, each with individual weapons, to defeat all attacking enemies before the can make it to the end. Make it through all waves without losing your health to beat that level. Beat all four levels in each four worlds to beat the game. Gain a gold, silver, or bronze metal, depending on how many enemies you let by. Each level is different, and you must place all new defenses each time. Your level, money, and health are indicated at the top of the screen, the defenses available are on the right of the screen. The waves on enemies are indicated at the bottom of the screen, click on them and/or press the fast forward to speed of the game. Earn money as you kill enemies and increase your defenses as more enemies attack.