To the surprise of some users, smartphones with Android come with some easter eggs hidden in strategic locations of the system. One of these easter eggs is a game like the famous “Flappy Bird”, but replacing the bird original game by a small green robot.
To access the game, Open the Settings application on your Android phone. Then, open section “About phone” (or something similar) and look for the track that shows the version of Android on your device. Tap it three times.
You will see an animation with the Android logo and version of your system – note that the game is only available for those who have an Android Lollipop or Marshmallow. Now, tap on the animation and hold your finger down for a few seconds until the game open.
You may have to repeat this last step a few times to work out. The game is a copy of “Flappy Bird”, where the towers are replaced with lollipops on the Android Lollipop or skewers marshmallow in the current Android. You can also access the easter egg on tablets with Google's system.