Coding for Good finalist makes the cut by copying Instamatch - is that original?

I just spent 3 weeks of my life making a unique program to submit to the Coding for Good challenge. I see that one of the three finalists simply copied a memory game like Instamatch. The rules said that submissions must be original.

If a contest says "all submissions must be original", do you think it means that only the code must be original, or the whole concept?