If by reset you mean delete your data files then once logged in you simply go to options and then click on erase personal data.
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The game Brain Training for Nintendo DS will cost you around $25.00. However, it can be found on online stores for as low as $19.99.
Nintendo DS Brain Training is a thinking game created to help people improve and sharpen their mental skills. This game is suitable for any age, though adults generally need the practice more.
You will have to delete any saved files for that game to reset it and start from the beginning. You can do this by accessing the memory section of the Nintendo DS.
Most DS games are not password protected. If one is you will most likely have to reset the game and start over.
You can either switch off the game, make sure you save, or reset the Nintendo. If that doesn't work try taking the game out and blowing into the system or cleaning the game.