The Post Office Game OnlineThe Post Office Game is a free Online Game at Infofully. This is a mail catching game and it will go the category games for 6-year-Old. This is a simple game in which your aim is to earn the score by catching the mail. For this, you can move the mailbox but be quick and change the colour of the mailbox fast and should match to the colour of letters. With each correct catch, you will get the score. Game Controls: Click to change the colour of mailbox to match with the letter and move your mouse to move the mailbox.