If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Need to defend your territory? A tesla tower may be what you're looking for. Climb in your electric tesla tower and get ready to deal some damage to your marauding enemies. Place your towers carefully to destroy the invaders before they can damage your tower. Harness the power of lightning and defeat them all! Each enemy unit destroyed earns cash, which you can spend on upgrades to help kill off even more enemies. It's the ultimate tower defense game, inspired by mad-science genius Nikola Tesla himself.