use

Use gravity to guide the balls

Use backgrounds from Android 7 Nougat

Use free WiFi access points all over the world and create your own

Use your heroes' unique powers to defend your towers

Use fun videos as your ringtone

Use your phone's camera to solve math problems

Use saws to carefully cut blocks

Use your Kung Fu skills to kill zombies

Use your thumbs to become a master drummer

Use your troops to destroy the enemy base