Free $5 Amazon Credit for Android Users

https://www.amazon.com/gp/feature.html? -enter your email and install the Amazon Underground app. Then using the app download one of these games:
Simple Sudoku
Simple Solitaire
Flow Free
Fruit Ninja Academy: Math Master
Elmo Loves 123s
My Boo
After you do that you will get an email about the promotion, and the credit should appear within 2 days. It’s valid for 10 days.