First of all please note that we do not recommend playing this game on your mobile.

However, if you decide to do so, please follow the next steps:

At first, you need to open boosteroid.com on the computer. Then launch a game and log in.

After logging in you need to pass a captcha. And then you can enter the game.

And now you should:

•  open boosteroid.com in the mobile browser (Google Chrome for Android, and Safari for IOS)
• enter your account and launch the game

If you do everything correctly, you will be able to continue playing in the mobile browser. 
Also note, that right after you launch the game in the mobile browser, you will see the message "You've just switched your session to another device" on the computer.