The competition is open only to regularly enrolled undergraduates, in colleges and universities of the United States and Canada, who have not yet received a college degree. No individual may participate in the competition more than four times. An eligible entrant who is also a high school student must be informed of this four time limit.
A college or university with at least three registered entrants obtains a team rank through the positions achieved by three designated individual contestants.
No collaboration or outside assistance is permitted during the examination. Each contestant, even if designated as a team member, must work independently on the examination questions.

Please note that there are no provisions for "unofficial" entrants.

The local supervisor must be a regular faculty member.