If you want to remain eligible for all awards, your team should have between 1-6 people, all of whom need to be at a CodeDay (but not necessarily your city's CodeDay).

If you don't care about competing for the "Best in Show" or "Best in Class" awards, your team can have as many people as you'd like, and you can even work with friends remotely!

Note that, regardless of the rules, we strongly recommend you work with no more than four people. Usually larger teams get less done by the end due to the additional coordination required.