If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
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.
This game is played with mouse only.