Desktop Tower Defense is the original and very fun tower defense game and you can play it online and for free on Silvergames.com. Play the popular defense game, which was created by Paul Preece. Build towers with various abilities on your desktop to defeat waves of invading tiny creeps.
At the beginning of the game you can choose the difficulty level. For example the easy mode only contains one line of creeps whereas the medium mode contains two. You must stop all attackers before they reach the other side. Try to create maze-like paths and use upgrades to increase the power of your defense. Have fun wit Desktop Tower Defense!