Your Kingdom Rush Battles User ID is a unique identifier for your account. Our support staff may ask for it to check your account history, verify your status, restore purchases, track progress, and provide other assistance. 

In Game:

•  On the main screen, tap the Settings ☰ button
  
  

• Scroll down to your User ID.
  
  

• Tap "copy" to copy it to your clipboard.
  
  

If you can't access the game

• Your User ID is displayed at the top-left of the loading screen in white letters and numbers.