Hear the the Mario coin-get so...
	Play Manhole...
	Play more Game and Watch games...

If you search for Nintendo or Nintendo related things such as systems or characters, you'll find greyed out entries that produce the coin sound from the mario games when selected.

While in the universal dictionary mode, search for "MANHOLE" and select the greyed out entry that appears. You'll be able to play the old Game&Watch game on your DS!

Choose all dictionaries (lowest entry on the upper left - "green") and enter the following in order to play the respective titles:

BALL
FLAGMAN
JUDGE