2-Step Verification -- Backup Codes
STEP 1
Sign into Google
STEP 2
Click on the App Switcher (Waffle) and then select Account
STEP 3
Select Security on the left navigation (fourth option down)
STEP 4
Scroll down to the third box Signing in to Google and click on 2-Step Verification
STEP 5
Select Backup Codes
STEP 6
Select + Get backup codes
STEP 7
The 10 codes listed will work only 1 time for your account. You can print, download, or take a picture of these codes for emergency offline situations.