Not to be smart ass (but it comes way too naturally), see rule #4. 

The Rules

1. Your entry should be a traditional roguelike, as described in the section above
2. You can work in a team.
3. You can work in the design for your project before the jam starts, provided you don't extend your work to create actual content that will be added to the game (i.e. detailed list of enemies, spells, items, etc.).
4. You can use pre-existing code and assets for the game, provided they could be used for other projects.
5. Content that is specific to your game, including assets, code, and data, should be developed within the time frame of the jam.
6. The idea is to create a complete game. You can of course develop post-jam versions of the game, but please keep a link to the original version
7. You must add screenshots to your entry page.

The idea of  course is to make this game during the 2 week period.  Don't continue working on a previous game, but you can use the code and assets from previous projects, but this game should be new and developed during the Jam.

Good luck.