Free • No download
About Planetary Defense
Sentinels of Earth — this is an arcade game where you assemble a battle machine, improve it and defend against waves of UFOs, drones and comets.
How to play
The controls are simple, but the gameplay is deep: * Navigate left or right to avoid enemy attacks and meteor showers. * On mobile, slide or press your finger on the screen to move; your weapons will shoot automatically as long as your finger is on the screen. Here's how a level plays out in Sentinels of Earth: * Each level consists of 10 stages. Survive and clear each wave. * Between stages, visit the shop to purchase new parts for your machine. * Combine identical parts to upgrade them and significantly increase your power. * Adapt your strategy to each arena: focus on defense, boost your economy, or maximize firepower to find the most effective combination.
Screenshots
Planetary Defense FAQ
Is Planetary Defense free to play?
Yes. You can play Planetary Defense online for free without buying the game or creating an account.
Can I play on mobile or a Chromebook?
Yes. The game runs in a modern browser on phones, tablets, laptops, desktops, and Chromebooks.
Do I need to download anything?
No. Press Play and the browser game loads directly on this page.
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