My friend's were over and i was showing off TD:U to them ... i had to go out of the room (nature calls) and when i came back a friend of mine had for some really odd and DUMB reason started a new game ... argggggggggggggggggggggghhh!!!!

i was almost 80% done in the game and i have stopped playing it now
i don't want to go through the hassle of starting a new game altogether, is there any way of recovering my old game?