Mystery Zone
The Mystery Zone (Japanese: なぞのばしょ Mystery Place) is an area in the Generation IV games that essentially serves as "filler space" between normally accessible outdoor and indoor areas. It exists all around Sinnoh, to facilitate the precise entry into the Underground, which has tunnels that travel under areas where no routes or cities exist. No Pokémon are found in the area; the geography is made predominantly of trees, water, or blank void space. In Pokémon Diamond, Pearl, and Platinum, the area is itself named as "Mystery Zone", with the location header popping up to display this name when the area is entered, while in Pokémon HeartGold and SoulSilver, the area is named ----.
The menu cannot be opened, and the touchscreen menu cannot be used, however a registered key item can be used to refresh the graphics in the area at any time. In Diamond, Pearl, and Platinum, the Mystery Zone's music is a slightly off-key version (and perhaps a beta mix of) of the theme of Routes 206, 207, 208, and 221 Sometimes, the background music used in the Underground can also be played, while in HeartGold and SoulSilver, it is the same theme as Route 29.
The Mystery Zone is normally inaccessible, but can be entered by use of the walk through walls cheat or, in Diamond and Pearl, by tweaking. By using the Mystery Zone, the on-field weather conditions can be tricked into not loading or loading incorrectly, and the map can be shifted by several tiles, while textures may instead be blank white.
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