Official contest rules can be found at

Teams may be of no more than four people and can be formed before or at the start of the event.

Each participant may only work on one project.

A project may not have any code dedicated to it until hacking begins on the Friday of the event. Setting up your development environment with SDKs in advance is fine.

Projects must be submitted by the time hacking ends on the Saturday of the event. After that, presentation materials may be worked on but no more design/development can be done on the submission.

Submissions will be judged on creativity, utility, presentation, and that special “Twitch” factor.