Press J to toggle invulnerability, K to add money.
During post-apocalyptic earth, the best way to be on top is to show brute strength and power, not to mention a good-looking tower which makes everybody so envious they want it for themselves.
Gear up, upgrade your tower and defend it like you've never done before and prepare for a serious beatdown.
Mouse to navigate, select and aim.
1-4 to activate rocket ability when available, mouse to select target area.