Pacman game using Beckers robot package

Create a pacman game with a simple gui based on Beckers robots and with a human player and a random robot. Need gui with a "CityView" and mous clickable-buttons for user (left, right, up, down, pickup). Game just starts right away when executed and should use only the standard java libraries and [login to view URL] package. User can pause game via a menu in window and also set difficulty to "easy" (default), "medium" and "Hard". Hard difficulty means random robots moves same speed as user. Medium is maybe 1/3 of the speed of the user and etc. The game has a prizeicon which the user needs to pickup before the other robot reaches user-robot. When game over(either won or lost) there is a dialog box showing the result and prompts user if he/she wants to quit or play again. Play again restarts the game. Changing difficultiy in-game restarts the game as well. I need the source code to learn hos to write same program myself so this is an educational example program I need.