Ludum Dare Extra Question

Can we use any assets for the extra, or do we have to make everything from scratch? If we have 2-3 weeks to do the extra, how will we be able play and rate compo/jam games when we havent finished a game yet, not to mention if we take the full 2-3 weeks for the extra game, when will we have time to play other ppls games.

I will be doing the extra regardless, but this is some things floating around in my mind about it right now. if you know any of the information let me know thanks.