Microsoft Solitaire Collection

When you load up a game of FreeCell, click on the menu bars in the upper left and go to Options. In here, you can input the number of the board/game you'd like to play. Input 1337 to load up that game, and then complete it. I would say it's in the medium-hard range, so not too difficult to complete legitimately. However, if you'd prefer to follow a guide or simply can't figure it out, refer to the following video, courtesy of Marcela Martinez.