Stop the hoards of enemies by placing towers in strategic positions. Place more towers or upgrade the ones you already have if it looks like enemies are getting through. Try to spend only as much as you need to defeat all the enemies each round, as you gain interest on whatever money remains at the beginning of each round. If you currently can't afford a certain tower or an upgrade for an existing tower, the corresponding button will be dimmed as an indication. A new wave of enemies will spawn every thirty seconds. Enjoy playing Duels Defense online for free on Ponged.com.
This is a fun game, but not very rewarding for the time spent playing. Should definitly be a leaderboard at the end