Here you've got 3 mail icons which contain Angels and Devils. Once you enter the game, the mail icon with the Angel symbol opens. Watch keenly as when the shuffling of the icons gets done, and pick up the correct Angel mail which was shown at first. In case of wrong selection, the devil icon appears and the game gets over. To keep on playing, you'll have to pick up the Angel mail correctly.

Use mouse to interact. Press M to mute the sound.