in the descriptions people are usually quite honest about their assets. The rules do say you can use assets from other sources as long as you reference them. But yeah, it is quite a tricky one. Original assets, sprites, sound are more likely to give the game a more innovative feel visually/sonically and perhaps make the game more fun as a result. At the same time, we have very advanced game engines and assets at our disposal nowadays which to someone from 20 odd years ago might seem like ‘cheating’. It’s a fine line. But, at the end of the day, who cares who wins, we’re not going to win anything really. All the people that managed to finish their game have won against themselves. ;-)