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The battle for interstellar supremacy is about to begin! Challenge players from all around the world and maybe even beyond in Starjack.io.

You'll start on your homeworld before you launch a campaign to take over the solar system in this addictive .io game.

How to Play Starjack.io?

Wisely deploy your ships to invade new planets, especially if they have a cannon or an EMP. Just be sure to protect your homeworld while you try to dominate those of your opponents. If they capture it, your dreams of conquest in the cosmos will come to an untimely end.

Game Controls


  • USE YOUR MOUSE to choose weapons and ships.
  • LEFT CLICK to target a planet.
  • LEFT CLICK AGAIN to send all of your ships from one planet to another.
  • RIGHT CLICK to send only 50% of your ships from one planet to another.


  • PRESS THE ARROW KEYS to explore the map.

What are the Tips and Tricks for Starjack.io?

  • Keep in mind that larger planets have more resources and can build ships more quickly.
  • Link planets to improve their defensive capabilities.
  • Use the scan ability to examine unexplored corners of the solar system.
  • Don’t forget about the shield ability. It will make your ships temporarily invincible.

Similar Games

Here are a few more multiplayer strategy games and other types of games that you should check out.

  1. Tanko.io
  2. Battleboats.io
  3. Pixel War
  4. Superhero.io

Who Developed Starjack.io?

Starjack.io was created by SideQuest Software Ltd.

Need help? watch our Walkthrough for this game.

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