Sega Master System / Mark III / Game Gear
and press ++, to see a credits screen. Then press , or to see messages from the programmers.
|Credits||: Kevin Seghetti's message to his girlfriend (now his wife)|
|: Jinda Pan's message to his wife and daughter||: Bill Chau's message to the world|
Note that this only works on the first release of the game, it was removed in the second version.
See the main page for Monopoly