See this blog post for details.
But, in short: this is a save file of a new game for Slingo Supreme DSiware that unlocks the Medium and Hard patterns, as the game has a bug that makes them otherwise impossible to unlock.
But, in short: this is a save file of a new game for Slingo Supreme DSiware that unlocks the Medium and Hard patterns, as the game has a bug that makes them otherwise impossible to unlock.