Invasion Tactical Defense is an impressively complex Flash game where your goal is to protect a nuclear factory from an attacking alien race.
To play, you buy cannons, upgrade the factory, and deploy personnel.
Sounds simple, right?
Well, itâ€™s not.
Thankfully, the gameâ€™s designers have added in plenty of settings to tweak and tune as you try to find the right mix, and even then itâ€™s not an easy win, so give it a shot and see what you can do.
The world depends on it.
Caution: The site requires you to register to play, so be prepared to create an account.