In 2005, Neal Nueller attempted a climb of Mount Everest. As he ascended and air pressures decreased, many electronics on his person - including several laptops and MP3 players, among other things - broke as a result, but his DS stood strong, and was even playable at the top of the mountain.
In the Nintendo DSi Sound application, if you record a sound, then hover the cursor over it for a few seconds, the sound bytes will be remixed and heard into a Super Mario Bros. overworld theme.
Nintendo DS prototypes were designed specifically for durability - during development, for example, no prototype was allowed that could not withstand ten 1.5-meter (~5 feet) drops onto concrete consecutively without a loss of function.
Many people mistake "DS" being an abbreviation for "Dual Screen" or some variant thereof. In reality, Nintendo intended it to stand for "Developer's System".
Exclusive to Japanese DS consoles, there was an option to connect to Nintendo WFC via a portable Wi-Fi router (Simple Start Wi-Fi). These were almost exclusively used in Japan, and thus this option was removed internationally. However, it can still be accessed (even though Nintendo WFC is now useless); tutorials for doing so can be found online.
The instruction manual includes instructions for setting up and inputting a WEP key from your router. The example key shown at that point in the manual is "8675309", likely referencing the 1981 song "867-5309: Jenny" by Tommy Tutone.
The Nintendo DSi was originally intended to have a second game card slot at the heavy request of fans; however, developers decided it made the console too bulky, and cut the idea.
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