Build up the instant recalling capability, with some cool UI and sounds
Game starts with a cool animation and buttons.
Click the button you just saw earlier containing the same picture and make the twins visible.
Hints available if it's turning to be difficult to recall the last seen.
Game can be paused too for later resumption.
Timer will be stopped and scores will be recorded into the database once the game is completed.
Have a nice experience playing the game of clicking the twins (identical).