Here's How to Play fullscreen in DarkOrbit
(1) First off, You need to check what resolution your computer can withstand.
(2) Open your game screen have make it a little smaller so you can see your backpage.
(3) Go to your resolution settings in game, select to the resolution and press save.
(4) Now you have to be quick on your backpage after you click save, your backpage will start to refresh "STOP IT!!" Go back to your game screen, and wait for the countdown dialog to go away, wait 5-10 seconds then close the game screen. (Don't Log Out, just close the game winow).
(5) Don't refresh your backpage just click the Green Start Button. If done correctly your game screen should be bigger.
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Troubleshooting
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Tip #1
If you ever log out and then start the game up and your game screen is back to normal, but the game says it's at the resolution you left it at. Click the "RESET" Button, and go back to Step 1. It'll be a hassle to fix all your settings, but if you want to play full screen it's the fall you'll have to take.
Tip #2
Sometimes if your screen has a scrollbar, press F11 to make your browser go full screen.
Tip #3
Sometimes it doesn't work so just keep trying. if it still doesn't work, go to Troubleshooting Tip #1.
If Necessary, I'll make a Video Tutorial on Youtube.