Kanji Sonomama Rakubiki Jiten Cheats - Nintendo DS
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Hear the the Mario coin-get sound
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.
Play Manhole
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!